GLOSSARY OF MARINE TERMS
NON - ALPHANUMERIC
<24M (Meters)
<300T (Tons) Displacement
>24M (Meters)
>300T (Tons) Displacement
12-Pack Inspection
6-Pack Inspection
A vessel classification for ships and yachts that are less than 24 meters (78.7 feet) in overall length. This category often includes smaller recreational vessels, sportfishing boats, and small commercial vessels.
A vessel classification based on displacement tonnage, where the vessel's weight is measured in tons. This category includes ships and yachts with a displacement of less than 300 tons.
A vessel classification for ships and yachts that are 24 meters (78.7 feet) or longer in overall length. This category typically includes larger recreational yachts, luxury motor yachts, superyachts, and commercial vessels.
A vessel classification based on displacement tonnage, where the vessel's weight is measured in tons. This category includes ships and yachts with a displacement of 300 tons or more.
An inspection conducted by the U.S. Coast Guard on small passenger vessels carrying between seven and 12 passengers for hire.
An inspection conducted by the U.S. Coast Guard on small passenger vessels carrying six or fewer passengers for hire, such as fishing charters or sightseeing boats.
AAbeam
Abel Tasman (1603-1659)
Ablation Zone
Able Seafarer
ABYC (American Boat & Yacht Council)
Admiralty Chart
Admiralty Law
Aft
Ahoy
Air Intake System
Aircraft Carrier
AIS (Automatic Identification System)
AIS Ice Transponder
Alee
Alloy
Almanac Data
Altitude
America's Cup
America's Cup
Amidships
Anchor
Anchor Ball
Anchor Crown
At right angles to the keel of the boat, but not on the boat.
Dutch explorer who made significant voyages to discover and map parts of Australia, New Zealand, and other Pacific islands.
The area of a glacier where mass is lost through melting or evaporation at a higher rate than it is gained through accumulation.
A qualified seafarer who may be engaged in operating and maintaining machinery and equipment in the engine room.
A non-profit organization that develops voluntary safety standards for the design, construction, equipage, repair and maintenance of boats.
A maritime chart produced by the UK Hydrographic Office which provides navigational information for seafarers.
Also known as Maritime Law, it is a distinct body of law which governs maritime questions and offenses.
The rear of the ship.
A term used to hail a boat or a ship, as "Boat ahoy!"
The system that supplies fresh air to the marine diesel engine for proper combustion, often including an air filter to remove contaminants.
A large warship that serves as a floating airbase, equipped with a flight deck and facilities for launching and recovering aircraft.
A tracking system used on ships and by vessel traffic services for identifying and locating vessels by electronically exchanging data with other nearby ships and AIS Base stations.
A specialized Automatic Identification System (AIS) transponder designed to provide real-time ice information to other vessels in the area.
The side of a ship that is downwind.
A combination of metals. Marine grade aluminium is usually an alloy for increased strength and resistance to corrosion.
General information about the GPS satellite constellation, including the rough orbits and approximate positions of the satellites. This data allows GPS receivers to quickly acquire and track the satellites.
The angular height of a celestial body above the observer's horizon, measured with a sextant.
The oldest international sailing trophy and one of the most prestigious events in sailing. It is a match race competition held between two yacht clubs representing their respective countries.
The oldest international sporting trophy, a prestigious yacht race that takes place between teams representing different countries.
In or towards the middle of a ship.
A heavy metal device attached to a ship by a cable or chain and used to hold the ship in place.
A black ball-shaped day signal hoisted by a vessel at anchor during the day to indicate its status.
The top part of an anchor where the shank and fluke(s) meet, distributing the load evenly across the
anchor.
Anchor Hitch
Anchor Hitch (Fisherman's Bend)
Anchor Light
Anchor Line
Anchor Rhode
Anchorage
Anemometer
Annex I - Oil Pollution
Annex II - Noxious Liquid Substances in Bulk
Annex III - Harmful Substances in Packaged Form
Annex IV - Sewage
Annex V - Garbage
Annex VI - Air Pollution
Annual Survey
Anodizing
Anti-Fouling Paint
Anti-Piracy Measures
Anticyclone
Apparent Wind
Arctic Circle
Armed Guards
A knot used to attach a rope to an anchor or other heavy objects.
A knot used for attaching a rope to an anchor or chain.
A white light used to indicate a vessel at anchor during the night, typically displayed at the highest point of the vessel.
A rope or chain used to connect the anchor to the vessel, providing a means to secure the vessel in position.
The anchor line, rope or cable connecting the anchor chain to the boat.
A location at sea where ships can lower anchors.
An instrument that measures wind speed.
The section of MARPOL dedicated to preventing and minimizing pollution from ships by oil, specifically focusing on spills from tankers.
The section of MARPOL that details the discharge criteria and measures for the control of pollution by noxious liquid substances carried in bulk.
The section of MARPOL dedicated to the prevention of pollution by harmful substances carried by sea in packaged form.
The section of MARPOL concerned with the regulation of ship's discharge of sewage into the sea to protect the marine environment.
The section of MARPOL that regulates the disposal of garbage from ships to reduce the amount of marine litter.
The section of MARPOL aimed at minimizing airborne emissions from ships (SOx, NOx, ODS, VOC and shipboard incineration) and their contribution to local and global air pollution and environmental problems.
A yearly inspection of a ship's condition, equipment, and compliance with regulations.
A process to increase the thickness of the natural oxide layer on the surface of aluminium parts, which can increase resistance to corrosion and wear.
Specialized paint applied to the underwater portion of a boat's hull to discourage the growth of subaquatic organisms such as barnacles and algae.
Strategies, protocols, and security measures employed by ships, crews, and maritime organizations to deter and respond to pirate attacks. This can include the use of armed guards, increased surveillance, and adherence to recommended shipping routes and practices.
A high-pressure weather system where the atmospheric pressure is greater than the surrounding area, often associated with calm, clear weather.
The wind speed and direction as measured aboard the moving boat.
The imaginary line located at approximately 66.5 degrees north latitude, marking the southernmost boundary of the Arctic region.
Trained security personnel hired by ship owners to deter and defend against pirate attacks while transiting high-risk waters.
Astern
Astronomical Tide
ATA Carnet
Aurora Borealis/Aurora Australis
Authorized Economic Operator (AEO)
Automatic Radar Plotting Aid (ARPA)
Autopilot
Average Adjuster
Average Bond
Azimuth
Azipod
The direction opposite to the forward motion of the vessel, usually referring to reverse or backward movement.
The tide as considered with regard to astronomic conditions only.
A document that facilitates the temporary importation of goods into multiple countries for a specified period without the need for customs clearance at each border.
Natural light displays in the Earth's sky, predominantly seen in the high-latitude regions around the Arctic and Antarctic, also known as Northern Lights and Southern Lights respectively.
A status granted to businesses involved in international trade that have demonstrated compliance with customs regulations, security standards, and best practices. AEOs may enjoy benefits such as simplified customs procedures and expedited clearance.
An electronic navigation aid that can process radar data to provide information to avoid collisions at sea.
An automated control system that steers the yacht, allowing the crew to perform other tasks or rest during long passages.
An expert who determines and settles claims for general average.
A financial guarantee provided to secure the release of cargo held under general average.
The angle between a celestial body (such as the sun, moon, or a star), and the North, measured clockwise in degrees from 0 to 360.
A propulsion system developed by ABB, consisting of a pod containing an electric motor and a propeller that can rotate 360 degrees, providing excellent maneuverability and efficiency.
B
Backspring
Backstay
Backtracking
A mooring line fixed to the shore-side aft, leading forward to control the movement of a boat's stern while in a berth.
A cable or rope running from the top or near the top of the mast to the stern of the sailboat. It is part of the standing rigging and helps to control the fore-and-aft position of the mast and the shape of the sails.
A function of DP systems that helps the vessel follow a precise path in reverse.
Ballast Weight, often in the form of heavy materials placed low in a vessel, used to provide stability.
Ballast Water Management
Ballast Water Management Certificate
Ballast Water Management Convention (BWMC)
Ballast Water Management Plan
Baltic and International Maritime Council (BIMCO)
The process of managing and treating the water carried in a ship's ballast tanks to prevent the transfer of invasive species between different ecosystems.
A certificate indicating a vessel's compliance with standards for the management and treatment of ballast water as outlined in the Ballast Water Management Convention.
Regulates the management and control of ballast water to prevent the spread of harmful aquatic organisms and pathogens.
A plan to manage the ballast water and sediments onboard a vessel to prevent the spread of harmful aquatic organisms from one region to another, established under the IMO's Ballast Water Management Convention.
A global shipping association providing standard contracts and industry guidance to promote fair and efficient shipping practices.
Banking Tilting a small high-speed vessel to one side to enhance maneuverability, especially during sharp turns or course changes.
Barcolana Regatta
Bareboat Charter
Barometer
Barometric Pressure
A massive sailing event held annually in Trieste, Italy, featuring a mass start of thousands of yachts of various sizes, creating a unique and spectacular spectacle.
A charter agreement where the charterer takes full control and responsibility for the vessel, including crewing, maintenance, and operational costs.
An instrument used to measure atmospheric pressure.
Another term for atmospheric pressure.
Barque A sailing vessel with three or more masts, typically square-rigged on the foremast and fore-and-aft rigged on the remaining masts.
Barrel A unit of measurement used in the maritime industry, usually for oil.
Bathymetry
Batten
Battery Bank
Battery Charger
Battery Isolator
The study of the "beds" or "floors" of water bodies, including the ocean, rivers, streams, and lakes. The term "bathymetry" is used to refer to underwater topography.
A thin strip of material (traditionally wood, now often fiberglass or carbon fiber) used to support the roach of a sail.
Multiple batteries connected in series or parallel to provide increased capacity or voltage for powering various onboard systems and equipment.
A device used to recharge marine batteries by converting AC power from shore power or generators into DC power suitable for battery charging.
A device that allows multiple batteries to be charged simultaneously from a single charging source while
Battery Monitor
Battleship
preventing backflow of current between them.
An electrical device that measures and displays the voltage, current, state of charge, and other parameters of marine batteries.
A heavily armored and armed warship designed for engaging enemy forces with large-caliber guns.
Beacon In the context of dynamic positioning, a beacon is a device that emits a signal that is picked up by the ship's systems. This signal helps the ship determine its position relative to the beacon.
Beam The width of the ship at its widest point.
Bearing The direction of an object expressed either as a true bearing as shown on the chart, or as a bearing relative to the direction of the boat.
Beat To sail to windward using a series of alternate tacks.
Beaufort Scale
Bergy Bits
Bernard Moitessier
Berth
Berth
Berth
Berth Term
Berthing
Berthing
Best Management Practices (BMP)
Bight
A scale for estimating wind speeds based on observations of sea conditions, developed by Sir Francis Beaufort in the early 19th century.
Large chunks of glacier ice or a very small iceberg floating in the sea. They are generally small enough to be dragged or moved with a boat hook.
French sailor known for his participation in the Golden Globe Race and his decision to abandon the race to continue sailing around the world.
A location in a port where a vessel can be moored, often indicated by a code or name.
A designated location at a port where a vessel can dock and load or unload cargo.
A designated area at a dock or quay where a vessel can be moored or secured.
Shipped under a rate that includes costs of loading and unloading.
The process of bringing a ship or boat to berth, a location in a port or harbour used specifically for mooring vessels while not at sea.
The process of bringing a vessel alongside a dock or berth for loading, unloading, or mooring purposes.
Industry-recognized guidelines and recommended practices developed by international organizations and industry bodies to enhance security and prevent piracy attacks on ships. They provide guidance on vessel hardening, crew training, and response procedures.
A loop in rope or line – a hitch or knot can be made using the bight of a rope.
Bilge The lowest part inside the ship, within the hull itself which is the first place to show signs of leakage. The bilge is often dank and musty, and considered the most filthy, dead space of a ship.
Bilge Keel
Bilge Pumps
Bilge Water
Bill of Entry
Bill of Export
A pair of fins or small keels attached to the sides of a hull, providing lateral stability and reducing
Devices used to remove bilge water (water that collects in the lowest part of a ship's hull). Essential to keep the vessel afloat in case of heavy weather or hull damage.
The accumulation of water, oil, and other fluids in the lowest parts of a vessel's hull. Proper management and treatment of bilge water is essential to prevent pollution.
A document submitted to customs authorities by an importer, providing information about the imported goods, their value, and other relevant details.
A document submitted to customs authorities by an exporter, providing information about the exported
Bill of Lading
Bill of Lading (B/L)
Binnacle
Biosecurity
Bismarck
Black Water
Blades
Blizzard
Block
Blue Moon Tide
Bollard
Bollard Pull
Bonded Stores
Bonded Warehouse
Boom
Boom Vang
Bottomry
goods, their value, and other relevant details.
A legal document issued by the carrier to acknowledge the receipt of goods and serves as evidence of the contract of carriage.
A document issued by a carrier which details a shipment of merchandise and gives title of that shipment to a specified party.
The stand or housing for the ship's compass located near the helm.
Measures and protocols implemented to protect against the introduction and spread of pests, diseases, and invasive species in the marine environment. This may involve inspections, quarantine procedures, and strict adherence to biosecurity regulations.
German battleship that served during World War II, known for its powerful armament and dramatic sinking after intense naval battles.
Wastewater generated from toilets and sewage systems onboard vessels. It contains human waste and requires proper treatment or disposal to prevent pollution.
The rotating components of a marine propeller that generate thrust by pushing against the water.
A severe snowstorm with high winds and low visibility, a common weather phenomenon in high latitude regions.
A pulley or set of pulleys. Used in a variety of ways to hoist loads, change the direction of ropes or gain mechanical advantage.
A higher than usual tide that occurs when a second full moon in a month coincides with perigee.
A short vertical post used on a ship or a quay for mooring. On a ship, they are also called bits.
A conventional measure of the pulling (or towing) power of a watercraft.
Goods that are stored in a bonded warehouse until they are brought aboard the ship. Often these are goods that are exempt from duties and taxes until they are offloaded in another port.
A secure facility approved by customs authorities where imported goods can be stored without paying import duties or taxes until they are ready for customs clearance.
The horizontal pole which extends from the bottom of the mast. Adjusting the boom towards the direction of the wind is how the sailboat is able to harness wind power in order to move forward or backwards.
A device that controls a boom's vertical movement and thus influences the shape of the sail.
When the master of a ship borrows money upon bottomry, he hypothecates the keel or bottom of the ship (pars pro toto) as a security for the repayment.
Bounty British ship known for the mutiny that took place on board in 1789, immortalized in literature and films.
Bow The front or forward part of a vessel.
Bow Thruster
Bowline
Bowline Knot
Bowline on a Bight
A maneuvering device located in the bow of a vessel used to enhance its maneuverability, particularly in tight spaces or during docking.
A type of knot producing a strong loop of a fixed size, topologically similar to a sheet bend.
A knot used to create a secure and fixed loop at the end of a rope.
A knot used for creating a fixed loop in the middle of a rope.
Braid-on-Braid
Brash Ice
Breakbulk Cargo
Breakbulk Terminal
Breaker
Bridge
Bridle
Brigantine
British Admiralty
Buddy System
Bulbous Bow
Bulk Cargo
Bulk Carrier
Bulk Carrier Classification
Bulkhead
Bunker Adjustment Factor (BAF)
Bunker Broker
Bunker Clause
Bunker Convention
Bunker Delivery Note (BDN)
Bunker Fuel
Bunker Sample
A rope construction consisting of a braided core and an outer braided cover, offering increased strength and reduced stretch.
Accumulations of floating ice made up of fragments not more than 2 meters across, the wreckage of other forms of ice.
General cargo that is not containerized or unitized, often consisting of irregularly shaped or oversized items requiring special handling.
A facility for handling non-containerized or bulk cargo that requires individual attention during loading and unloading.
A wave that collapses and breaks as it approaches the shore or encounters a change in bottom depth.
The location from where the captain steers the ship; it contains all the navigational instruments.
A line or cable used to distribute the load of a towline or mooring line to multiple points.
A two-masted sailing vessel with square-rigged sails on the foremast and fore-and-aft sails on the mainmast.
The United Kingdom's national hydrographic office responsible for providing navigational charts, publications, and hydrographic services.
A practice where divers are paired with a buddy for safety, communication, and assistance during the dive.
A protruding bulb at the bow of a ship just below the waterline, which modifies the way the water flows around the hull, reducing drag and thus increasing speed, range, fuel efficiency, and stability.
Unpackaged, homogeneous cargo, such as grains, coal, or oil, transported in large quantities without individual packaging.
A ship specifically designed to transport vast amounts of cargo packed in different forms, like a bulker or bulk freighter.
Specific classification standards and rules for bulk carrier ships.
An upright wall within the hull of a ship. In a motor yacht, bulkheads often provide structural strength as well as divide the space into rooms or compartments.
An extra charge levied on shippers to compensate for fluctuations in the price of the ship's fuel.
A person or company that acts as an intermediary between the buyers and sellers of bunker fuel.
A clause in a charter party which determines which party is responsible for supplying and paying for the ship's fuel.
An international treaty adopted in 2001 to ensure that adequate, prompt, and effective compensation is available to persons who suffer damage caused by spills of oil, when carried as fuel in ships' bunkers.
A document which details the quantity and quality of fuel being supplied to a vessel during bunkering. This is signed by both the supplier and the receiver of the fuel.
The fuel that is used in the ship's bunkers to power its engines. Traditionally, this was a type of fuel oil, but increasingly LNG and other fuels are being used.
A sample of fuel taken during bunkering. This is usually kept for a certain period after the fuel is consumed to confirm quality if required.
Bunker Survey
Bunker Trader
Bunkering
Bunkering Inspection
Bunkerworld
Buoy
Buoyancy Compartment
Buoyancy Control Device (BCD)
Burgee
Buyer's Broker
A survey that is carried out to measure and ascertain the quantity of bunker fuel onboard a vessel. This can be done for several reasons, including at the beginning or end of a charter party, or when buying or selling a vessel.
A person or company that purchases fuel from suppliers and sells it to end users. Unlike a broker, a trader takes title to the fuel.
The process of supplying a ship with fuel. This can also refer to the shipboard logistics of loading fuel and distributing it among available bunker tanks.
An inspection conducted by the U.S. Coast Guard to ensure safe fuel transfer operations, including proper documentation, equipment condition, and compliance with safety procedures.
An online publication dedicated to the marine fuels industry. It provides news, prices, and analysis for marine fuel buyers, sellers, brokers, traders, and other marine fuel industry professionals.
An anchored float used for marking a position on the water or a hazard or a shoal and for mooring.
An airtight compartment in a vessel that adds buoyancy, helping it to float.
A piece of equipment worn by divers to control their buoyancy by adjusting the amount of air in the BCD bladder.
A distinguishing flag, regardless of its shape, of a recreational boating organization.
A marine broker who represents the buyer's interests in purchasing a vessel, assisting with negotiations, inspections, and transaction arrangements.
C Band Satellite Communications
Cable Layer
C band operates in the frequency range between 4 and 8 GHz, offering a balance between signal quality and susceptibility to rain fade, commonly used for satellite television broadcasting and maritime communications.
A specialized vessel used for laying submarine telecommunications or power cables on the ocean floor.
Calving The process by which chunks of ice break away from the edge of a glacier to form an iceberg.
Cam Cleat
A mechanical cleat used to hold a line automatically. It uses two spring-loaded cams that come together to clamp the line.
Camber The curve of a sail in cross section.
Capsize When a boat or ship is overturned in the water.
Capstan A vertical-axled rotating machine developed for use on sailing ships to apply force to ropes, cables, and hawsers.
Captain James Cook British explorer and navigator who made detailed maps of Newfoundland and the Pacific Ocean, completing three voyages and discovering new lands.
Cargo Gear Inspection
Cargo Handling
An inspection conducted by the U.S. Coast Guard to verify the integrity and safe operation of cargo handling equipment, such as cranes, derricks, and lifting devices.
The process of loading, unloading, and transferring cargo to and from ships, trucks, and other transportation modes within the port.
Cargo Handling Equipment Machinery and equipment used for lifting, moving, and manipulating cargo, such as cranes, forklifts, and conveyor systems.
Cargo Inspection
Cargo Manifest
Cargo Plan
Examination of cargo to verify its condition, quality, and compliance with contractual requirements.
A document listing the cargo, passengers, and crew of a ship for the use of customs and other officials.
A plan showing the locations and significant details of all cargo aboard a ship.
Cargo Securing Inspection Inspection of cargo securing arrangements to ensure compliance with safety standards and prevent shifting or damage during transit.
Cargo Securing Manual
Cargo Survey
Cargo Tracking
Carnet ATA
Carrick Bend
Cast Off
Catamaran
A document outlining procedures and guidelines for safely stowing and securing cargo on board a ship to prevent damage or accidents.
A survey conducted to verify the quantity, condition, and stowage of cargo on board a vessel. It ensures compliance with cargo handling standards, monitors cargo security, and assesses any damage or loss during transportation.
The process of monitoring and tracking the movement of cargo within the port, ensuring transparency and visibility throughout the supply chain.
An international customs document that allows the temporary importation of goods for specific purposes, such as exhibitions, trade shows, or professional equipment, without paying import duties or taxes.
A symmetrical knot used for joining two thick ropes together.
To let go.
A boat with two hulls.
Cavitation
Celestial Fix
Celestial Navigation
Centerboard
Certificate of Competency (CoC)
Certificate of Inspection (COI)
Certificate of Origin
Chain Locker
Chandlery
The formation of air bubbles or vapor pockets around a marine propeller due to low pressure, which can reduce propeller efficiency and cause damage.
The determination of a vessel's position using celestial observations, typically by taking multiple sightings of celestial bodies and intersecting the lines of position to obtain a fix.
A method of navigation that uses celestial bodies, such as the sun, moon, stars, and planets, to determine a vessel's position at sea. It involves measuring the angles between celestial bodies and the horizon to calculate latitude and longitude.
A retractable keel which pivots out of a slot in the hull of a sailboat, used to counteract the lateral forces of the wind on the sails.
A form of license every mariner must obtain to work on ships. The certificate ensures that the concerned person has the necessary education, training, and experience to perform the tasks at sea.
A document issued by the U.S. Coast Guard that certifies a vessel's compliance with safety and operational standards.
A document that certifies the country of origin of goods and is used for customs purposes to determine eligibility for preferential trade agreements or tariffs.
The compartment in the forward part of a ship or boat where the anchor chain is stowed.
The goods and the business of a chandler, a person who sells equipment for ships.
Chart A map used for navigation, especially for marine areas and airspace.
Chart Datum
Chart Datum
Chart Table
Charter Brokerage
Charter Party
Charter Rate
Charterer's Representative
Chartplotter
Chief Engineer
Chine
Christopher Columbus
The water level that depths displayed on a chart are measured from. It is usually a tide level, such as mean low water.
The reference level used to measure depths on nautical charts, typically the low water level at a specific location.
A desk where the navigation charts are studied.
Marine brokerage services focused on arranging the charter or lease of vessels, including negotiating terms, drafting contracts, and ensuring compliance.
A contract or agreement between the owner of a vessel (the "shipowner") and the charterer, outlining the terms and conditions of the vessel's charter.
The agreed-upon price or rate at which the vessel is chartered, usually expressed as a daily, monthly, or lump sum amount.
A person or entity appointed by the charterer to act on their behalf and handle charter-related matters during the charter period.
An electronic device used in marine navigation that integrates GPS data with an electronic navigational chart.
The senior engineer officer responsible for the satisfactory working and upkeep of the main and auxiliary machinery and boiler plant on board ship.
The intersection of the bottom and side on a boat hull.
Italian explorer who completed four voyages across the Atlantic, opening the way for widespread European exploration and the eventual colonization of the Americas.
Christopher Columbus (1451-1506)
Italian explorer who completed four voyages across the Atlantic Ocean, opening the way for widespread European exploration and the eventual colonization of the Americas.
Citadel A secure space or room onboard a ship where the crew can take shelter during a pirate attack. It is typically equipped with communication systems, supplies, and fortified access points.
Class Approval
Class Certificate
Class Flag
Class Notation
Class Society
Classic Yacht
Classification Notation
Verification by a classification society that equipment or components meet applicable standards.
A certificate issued by a classification society to a ship or vessel, confirming that it meets the applicable rules and regulations, design standards, and safety requirements set by the society.
A flag used to identify a specific racing class or division during a sailing regatta or race.
Additional classification symbols or codes that indicate specific features or capabilities of a vessel.
An organization that provides classification and certification services, verifying that a ship meets specific standards of construction, maintenance, and safety.
A yacht characterized by traditional design and styling, often with wooden hulls and classic lines.
Additional class-specific notations or symbols assigned to a vessel by a classification society, indicating compliance with specific rules, standards, or additional features beyond the basic classification requirements. Examples may include notation for ice-class, dynamic positioning, or environmentally friendly operations.
Classification Rules
Classification Society
Classification Surveyor
Clean Marina Program
Cleat
Cleat Hitch
Guidelines and criteria established by classification societies for ship design, construction, and operation.
An independent organization that sets and enforces technical standards for the design, construction, and maintenance of ships and offshore structures. They conduct surveys and issue class certificates to ensure vessels meet specified criteria for safety and seaworthiness.
A surveyor employed by a classification society to conduct inspections and surveys of ships.
A voluntary program or certification that recognizes marinas for their efforts in implementing environmentally friendly practices and pollution prevention measures.
A fitting to which lines are made fast, the classic design being an approximately eight-sided "jam cleat."
A knot used to secure a line to a cleat or bitt on a boat or dock.
Clew The lower corner(s) of a sail.
Clipper Round the World Yacht Race
Clipper Ship
Clipper Ventures
Close Hauled
A biennial global yacht race that involves a fleet of identical yachts crewed by amateur sailors from all walks of life. The race takes place over several legs and covers a distance of approximately 40,000 nautical miles.
A fast sailing ship of the mid-19th century, known for its sleek design and speed, commonly used in the tea and opium trades.
The company behind the Clipper Round the World Yacht Race. It organizes the race and provides training and support to amateur sailors participating in the event.
Sailing as close as possible towards the wind (usually about 45 degrees off from where the wind is blowing directly from).
Closing The final stage of a vessel sale transaction, involving the transfer of ownership, payment settlement, and completion of necessary paperwork.
Closing Costs
The various expenses associated with the completion of a vessel transaction, including legal fees,
Cloud Cover
Clove Hitch
Club Burgee
Coastal Survey
Coating Inspection
Cockpit
CODAG
Code of Safe Practice for Ships Carrying Timber Deck Cargoes (TDC)
Cold Front
Collision Regulations (COLREGs)
Comité Maritime International (CMI)
Commercial Brokerage
Commercial Vessel
Commissary
Commissions
Companionway
Compass
Compression Ratio
Condition Assessment Program (CAP)
Condition Assessment Survey (CAS)
Condition Monitoring
registration fees, taxes, and documentation costs.
The portion of the sky covered by clouds.
A knot used to secure a rope to a post or pole, providing a quick and temporary fastening.
A triangular or swallow-tailed flag that represents a yacht club or sailing organization. It typically features the club's emblem or logo.
Hydrographic surveys conducted along coastlines, focusing on nearshore areas, navigational approaches, and hazards to navigation.
An inspection of the protective coatings applied to a ship's hull, tanks, or other structures. It ensures the integrity of the coating system, identifies areas of corrosion or damage, and verifies compliance with coating specifications.
The area towards the stern of a small decked vessel that houses the rudder controls.
Combined Diesel and Gas Turbine - A propulsion system that combines diesel engines and gas turbines to drive the vessel's propellers, providing flexibility in power output and fuel efficiency.
Provides guidelines and requirements for the safe stowage and securing of timber deck cargoes on ships.
A boundary of an advancing cold air mass and retreating warmer air mass where cold air replaces warm air.
International rules and regulations governing the conduct and navigation of vessels to prevent collisions at sea.
An international organization that promotes the harmonization and unification of maritime law and regulations worldwide.
Marine brokerage services focused on commercial ships, such as bulk carriers, tankers, container vessels, or offshore support vessels.
A vessel that is primarily engaged in commercial activities, such as transportation of goods or passengers, fishing, or offshore operations, for commercial gain.
A store on a ship where food and other supplies are kept.
The fees or compensation paid to marine brokers for their services, typically calculated as a percentage of the vessel's sale or charter price.
A raised and windowed hatchway in the ship's deck, with a ladder leading below and the hooded entrancehatch to the main cabins.
A device that indicates the direction relative to the geographic cardinal directions, or points.
The ratio of the volume in the combustion chamber at the end of the piston's compression stroke to the volume at the end of the piston's expansion stroke, influencing engine efficiency and power output.
A systematic assessment of a ship's condition and maintenance requirements by a classification society.
A comprehensive survey that evaluates the overall condition of a ship, assessing its structural integrity, equipment functionality, systems performance, and general maintenance requirements.
The process of continuously monitoring and analyzing key parameters of a ship's machinery, systems, and
structures to detect abnormalities, identify potential issues, and optimize maintenance and performance.
Congestion Clause A clause in the charter party that addresses the allocation of costs, risks, and liabilities associated with port congestion or delays.
Consecutive Voyage Charter A charter agreement where multiple voyages are contracted as a series of consecutive charters, typically for the carriage of a specific commodity or cargo.
Consignee
Consignment
Constructive Total Loss
The party or company designated to receive the cargo at the destination, often the buyer or importer.
The delivery of goods to a carrier to be shipped to a designated person for sale. A shipment.
A loss where the cost of repair or recovery exceeds the insured value.
Container Ship A type of cargo ship specifically designed for the transportation of containers, typically using standardized intermodal containers.
Container Ship Classification
Specific classification standards and rules for container ships.
Container Terminal A specialized area within a port where containers are handled, stored, and transferred between different modes of transportation.
Containerization A system of intermodal freight transport using intermodal containers (also called shipping containers and ISO containers) made of weathering steel.
Continuous Survey **A survey that is conducted periodically throughout the life of a ship to ensure ongoing compliance with rules and regulations. It involves regular inspections and examinations to maintain the vessel's class status.
Contour Line
Controllable-Pitch Propeller
A line on a chart or map which connects points of equal depth.
A marine propeller with blades that can be rotated to change the pitch angle, allowing for optimized performance across various vessel speeds and conditions.
Convertible Yacht A yacht with open spaces that can be enclosed or transformed to adapt to various weather conditions.
Cooling System
The system that circulates coolant (usually water or a mixture of water and antifreeze) to absorb excess heat and maintain the optimal operating temperature of a marine diesel engine.
Corvette A small, lightly armed warship used for coastal defense, patrol, and escort duties.
COSPAS-SARSAT
Counter-Piracy Operations
An international satellite system that provides distress alert and location data to assist search and rescue operations. It detects and locates the signals of beacons operating on 406 Megahertz (MHz). The position of the distress and other related information is forwarded by the system to the appropriate search and rescue authorities.
Military or naval operations conducted by international coalitions, navies, or regional organizations to combat piracy and protect shipping lanes in high-risk areas. These operations may include patrols, escort services, and the interdiction of pirate vessels.
Course The intended path of a vessel in the horizontal plane.
Course The designated route or path that yachts must follow during the race, often marked by buoys or other navigation aids.
Course Over Ground (COG) The actual direction that a vessel is moving over the ground, as indicated by a GPS or satellite navigation system.
Courtesy Flag
A flag of a foreign country that is hoisted as a sign of respect and courtesy when a vessel enters the
territorial waters of that country.
CPP Controllable Pitch Propeller - A type of propeller where the pitch of the blades can be adjusted while the vessel is in operation, optimizing performance under different load and speed conditions.
CQR Anchor (Coastal Quick Release)
Cranes and Hoists
Crankcase
An anchor type known for its hinged, plough-like design that allows it to turn and dig into the seabed.
Heavy-duty lifting equipment used in shipyards for moving heavy components and materials during construction and maintenance.
The housing that encloses the crankshaft and other internal components of a marine diesel engine, providing lubrication and protection.
Crest The highest point of a wave, typically characterized by a curvature or peak.
Crew The individuals who assist in the operation, handling, and maneuvering of the yacht during the race.
Criminal Jurisdiction
Cringle
Crossing Situation
Cruise Ship
Cruising Association
Cryosphere
Cunningham
Current Speed
The authority of a state to exercise criminal law and prosecute offenses committed on board a vessel flying its flag, regardless of the vessel's location.
A ring or grommet, usually on the corners and edges of sails, to attach lines or for reinforcement.
A situation in which two vessels are crossing each other's path, with the risk of collision if the give-way vessel does not take appropriate action. (COLREGS)
A passenger ship designed for leisure voyages, offering amenities, entertainment, and accommodation for tourists on extended trips.
An association that supports and represents the interests of cruising sailors, providing information, resources, and a community for those who enjoy exploring the world's oceans and waterways.
The frozen water part of the Earth system, which includes snow, glaciers, ice caps and ice sheets, icebergs and sea ice, ice on lakes and rivers as well as permafrost and seasonally frozen ground.
A line used to adjust the tension on the luff of a sail, named after its inventor, Briggs Cunningham, a victorious America's Cup skipper and yacht builder.
The rate at which water flows in a current, typically measured in knots or meters per second.
Customs Government agencies responsible for collecting duties, tariffs, and enforcing import and export regulations at the port.
Customs Bond
Customs Bonded Warehouse
Customs Broker
Customs Broker
Customs Clearance
A financial guarantee provided by an importer or customs broker to cover potential customs duties, taxes, or penalties.
A warehouse where dutiable goods are stored pending payment of duty or removal under bond. The goods are not subject to duties if reshipped to foreign points.
A person or company licensed to facilitate the customs clearance process on behalf of importers and exporters. They assist with documentation, tariff classification, valuation, and compliance with customs regulations.
An intermediary who assists with customs clearance procedures, ensuring compliance with customs regulations and facilitating the smooth movement of cargo across borders.
The process of fulfilling legal requirements and procedures to allow goods to enter or leave a country through a port. It involves declaring and documenting the contents, value, and origin of the goods, and paying any applicable customs duties or taxes.
Customs Declaration
A document that provides information about the goods being imported or exported, including their description, value, quantity, and origin. It is submitted to customs authorities for customs clearance.
Customs Duties Taxes imposed on imported or exported goods by customs authorities, usually based on the value or quantity of the goods.
Customs Seizure
Customs Value
The confiscation or retention of goods by customs authorities due to non-compliance with customs regulations, such as smuggling or prohibited items.
The declared or assessed value of goods for customs purposes, which is used to determine the customs duties and taxes.
Cutty Sark British clipper ship famous for its speed and role in the tea trade, now a museum ship in Greenwich, London.
Cyclone A large system of winds that rotate around a central area of low atmospheric pressure. They are counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
Cylinder A component of a marine diesel engine where combustion occurs. Multiple cylinders are arranged in a specific configuration (e.g., inline, V-shape) to provide power and smooth operation.
Damage Survey
A survey carried out to assess the extent and cause of damage to a ship or its cargo resulting from accidents, collisions, grounding, or other incidents. It helps determine necessary repairs and evaluates potential liability or insurance claims.
Dame Naomi James New Zealand sailor who became the first woman to complete a solo circumnavigation of the globe via Cape Horn in 1978.
Danforth Anchor
Dangerous Goods
Dangerous Goods by Sea Certificate
Davit
Dawn Riley
Day Cruiser
Dead Freight
Dead Reckoning
Deadfreight
Deadhead
Deadweight
Deadweight Tonnage (DWT)
Deck Officer
Deep Cycle Battery
Deep-V Hull
Demise Charter
Demise Clause
Demurrage
A lightweight type of anchor that uses a stock at the crown to which two large flat triangular flukes are attached.
Hazardous materials or substances that pose a risk to health, safety, or the environment, requiring special handling, packaging, and documentation.
A certificate that indicates the holder is trained to handle and ship dangerous goods in maritime transport, as per IMDG Code requirements.
A structure, often a single pole or beam, used for supporting, suspending or lowering equipment. Most commonly used on a ship for the lifeboats.
American sailor and the first woman to manage an America's Cup team, promoting gender equality in professional sailing.
A yacht designed for day trips or short cruises, often with minimal overnight accommodations.
Space booked by a shipper or charterer on a vessel but not used.
A method of estimating a vessel's current position based on a previously known position, and advancing that position based upon known or estimated speeds over elapsed time, and course.
The amount of cargo space that remains unutilized or empty in a vessel, for which the charterer may be required to pay compensation to the shipowner.
A sailing trip with no cargo or passengers.
The maximum weight that a ship can safely carry including cargo, fuel, fresh water, and crew.
The total weight of cargo, fuel, ballast water, provisions, and other consumables that a vessel can carry when fully loaded. It represents the difference between the loaded and lightship weights.
A member of the ship's crew who is responsible for the navigation, communications, crew, cargo and overall operation of the vessel.
A battery designed to provide a consistent level of power over an extended period, making it suitable for applications that require continuous and sustained energy output, such as running onboard systems or powering trolling motors.
A hull form with a deep, sharp V-shaped bottom, providing excellent seakeeping capabilities and a smooth ride in rough seas.
Another term for a bareboat charter, where the charterer assumes complete control and ownership-like rights over the vessel.
A clause in the charter party that transfers full control and responsibility of the vessel to the charterer, as in a bareboat or demise charter.
The compensation payable by the charterer to the shipowner for exceeding the agreed-upon laytime or time allowed for loading or unloading.
Dennis Conner
Depth Sounder
Desalination
Desalination System (or Water Maker)
Designated Person Ashore (DPA)
Despatch
Destroyer
Detention
Deviation
Dew Point
Diameter
Diesel Electric
Differential GPS (DGPS)
Dinghy
Displacement
Displacement Hull
Displacement Tonnage
Distress Flares
Distress Frequency
Distress Signal
Diurnal Tide
Dive Computer
American sailor who won the America's Cup four times, including a historic victory in 1987 when he reclaimed the Cup for the United States.
A device used to measure the depth of water beneath a watercraft.
The process of removing salt from seawater to make it suitable for human consumption and irrigation.
A system that removes salt and other minerals from seawater, making it safe to drink.
A person appointed by the ship management company who is responsible for monitoring the safety and pollution prevention aspects of the operation of each ship and ensuring that adequate resources are applied.
The compensation payable by the shipowner to the charterer for completing loading or unloading before the agreed-upon laytime expires.
A fast and maneuverable warship primarily used for escorting larger vessels and engaging in antisubmarine warfare.
The action taken by port authorities to prohibit a ship from sailing until identified deficiencies or noncompliance with regulations are rectified.
The angular difference between magnetic north and the direction that the compass needle points, caused by local magnetic fields within the boat.
The temperature at which dew can form. It is a measure of atmospheric moisture.
The overall width of a marine propeller, measured from the tip of one blade to the opposite tip.
A propulsion system that uses diesel engines to generate electricity, which is then used to power electric motors that drive the propellers.
A technique that improves the accuracy of GPS positions by using reference stations on the ground to broadcast correction signals to GPS receivers.
A small open boat, often a ship's boat.
The weight of the volume of water that the ship displaces when it is floating, which is equivalent to the weight of the ship.
A type of hull designed to move through the water, displacing a weight of water equal to the weight of the boat, which typically provides a smoother ride in rough seas.
The weight or mass of water displaced by a vessel's hull, measured in tons. It is a measure of the vessel's volume and buoyancy.
Pyrotechnic devices used as a signaling mechanism in case of distress.
Frequencies used for emergency signals, 406 MHz for COSPAS-SARSAT beacons, 121.5 MHz for VHF airborne emergency use, and several others for MF, HF, and VHF maritime use.
An internationally recognized means for a ship to signal that it is in distress and requires assistance.
A tide that has one high water and one low water each day.
An electronic device that monitors and displays critical dive information, such as depth, dive time, decompression limits, and nitrogen levels.
Dive Flag
Dive Table
Diving Flag
Docking
Docking Plan
Dockline
Dockmaster
Dodger
Doldrums
Doppler Radar
Double Braid
Double Fisherman's Knot
Double Hull
Double Sheet Bend
Downhaul
Downwelling
Downwind
DP Class 0
DP Class 1
DP Class 2
DP Class 3
A flag or buoy with a distinctive design used to mark the presence of divers in the water to warn boaters and other watercraft.
A printed or digital device used to plan and track dive profiles, helping divers manage their time, depth, and decompression stops.
A flag, typically a red flag with a white diagonal stripe, used to indicate that diving or snorkeling is in progress in the vicinity.
The controlled approach and securing of a vessel to a berth or structure using mooring lines or other methods.
A detailed plan that outlines the sequence of activities and steps to be taken during a drydocking operation. It includes scheduling, preparations, safety procedures, and work assignments.
A rope that secures the boat to the dock.
An individual responsible for coordinating and overseeing vessel movements and operations within a port or marina.
A protective screen, usually fabric, mounted over the companionway of a ship to prevent water from entering the cabin.
An area of the ocean where the winds are calm, often near the equator.
A radar system used to determine the location and velocity of a storm, clouds, precipitation, etc.
A type of rope construction consisting of a braided core and a braided outer cover, offering high strength and durability.
A knot used for joining two ropes together to create a secure and strong connection.
A ship design with an additional inner hull for enhanced safety and pollution prevention.
A more secure version of the sheet bend, used for joining two ropes of different sizes together.
A line which is used to pull down a sail or a yard, to either reduce the sail area or lower the yard.
The downward movement of surface water, typically caused by convergence or sinking of water masses, often associated with the accumulation of warm surface water.
Sailing with the wind at your back, making progress towards the leeward mark or point of the course.
Dynamic Positionsing without additional redundancy or back up. Typically insttaled in high slass recreational vessels entering remote anchorages or for short handed navigation
Dynamic positioning system with no redundancy, loss of position may occur in the event of a single fault.
Dynamic positioning system with redundancy so that loss of position should not occur from a single fault of an active component or system.
Dynamic positioning system with further enhanced system redundancy so that loss of position should not occur from any single failure including a completely burnt fire sub division or flooded watertight compartment.
DP Operator (DPO) A certified officer responsible for controlling a ship's movements using the dynamic positioning system.
Draft
Draft Survey
The depth of water a boat draws.
A measurement of a ship's draft to determine its displacement and cargo quantity.
Draught (or Draft)
The vertical distance between the waterline and the bottom of the hull (keel), or the depth of water that a ship requires to float freely.
Drayage The transport of goods by road, typically for short distances between a port or terminal and the final destination.
Dredger A vessel equipped with machinery and equipment for excavating, removing, or dredging sediments, rocks, or debris from the seabed or waterways.
Dredging
Dredging Depth
The process of removing sediments and debris from the bottom of lakes, rivers, harbors, and other water bodies.
The desired depth to be achieved or maintained through the dredging process to accommodate vessels and prevent grounding.
Drift Ice Sea ice that floats on the sea surface and moves with winds and ocean currents.
Drogue
A device used to slow a boat's drift in a storm, usually a canvas cone or series of cones dragged from the stern.
Drug and Alcohol Testing Testing conducted by the U.S. Coast Guard to ensure compliance with drug and alcohol regulations, including random testing of crew members and operators.
Dry Dock
Dry Stores
Drydock
Drydock Survey
Dunes
Dunnage
Duty and Tax Calculation
Dynamic Positioning System
Dynamic Rope
Dyneema
A structure or basin that can be flooded to allow a vessel to be floated in and then drained for maintenance, repairs, or construction.
An area on the ship where dry food and other non-perishable items are stored.
A large facility or structure, usually a floating dock or graving dock, where ships can be brought out of the water for inspection, maintenance, and repairs. Drydocks are equipped with pumps, cranes, and other equipment to facilitate work on the vessel.
A comprehensive inspection and maintenance process that involves taking a ship out of the water and placing it in a drydock facility. This allows for closer examination, repairs, and maintenance of the hull, propellers, rudders, and other underwater parts.
Mounds or hills of sand formed by wind and stabilized by vegetation, often found along the backshore or behind the beach.
Loose wood, matting, or similar material used to keep cargo in position inside a ship's hold.
The computation of customs duties, taxes, and other fees payable on imported goods based on their value, quantity, and classification.
A computer-controlled system that automatically maintains a vessel's position and heading using thrusters, allowing for precise station-keeping.
A rope designed to stretch and absorb energy, commonly used in applications where shock absorption is required, such as mooring lines or towing lines.
A high-strength synthetic fiber known for its exceptional strength-to-weight ratio, commonly used in highperformance marine ropes.
Easting
Ebb Tide
Echo
Echo Sounder
Echo Sounding
Eddy
Electric Drive
Electro-Technical Officer (ETO)
Electronic Chart Display and Information System (ECDIS)
Electronic Navigational Charts (ENC)
Ellen MacArthur
Emergency Beacon
Emergency Communication
A distance measured eastward along a line of latitude.
The outgoing or falling tide, occurs between high tide and low tide.
An echo is the reflected sound wave that returns to the SONAR system after bouncing off an object or the seafloor. By analyzing the time it takes for the echo to return and the characteristics of the echo, the SONAR system can determine the distance, location, and properties of the object or seafloor.
A device used to measure the depth of water by transmitting sound waves into the water. The time it takes for the sound waves to bounce back is used to calculate the depth.
Determination of the depth of water with a sounding device that uses the time interval between emission of a sound signal and the return of its echo from the bottom.
A circular or whirlpool-like movement of water, typically caused by the interaction of currents or obstacles.
A propulsion system that uses electric motors powered by batteries or other sources of electrical energy to drive the propeller.
An officer who is part of the engineering staff on a merchant vessel and is responsible for all of the electrical systems on the ship.
A computer-based navigation system that uses electronic navigational charts (ENCs) and integrates GPS data to provide accurate and up-to-date information for safe navigation.
Digital charts based on hydrographic survey data, used in electronic charting systems for safe navigation.
A renowned British sailor who set the record for the fastest solo circumnavigation of the globe in 2005, completing the journey in just over 71 days. She is also known for her philanthropic work through the Ellen MacArthur Foundation.
A signaling device that emits a distress signal, such as a Personal Locator Beacon (PLB) or Emergency Position Indicating Radio Beacon (EPIRB), to aid in rescue efforts.
The establishment and maintenance of communication channels during emergencies, ensuring effective coordination and information exchange.
Emergency Drill Practice exercises conducted on board a vessel to familiarize the crew with emergency response procedures and protocols.
Emergency Evacuation
Emergency Flares
Emergency Position Indicating Radio Beacon (EPIRB)
Emergency Response Plan
Emergency Response Team
The process of safely and efficiently evacuating individuals from a vessel or offshore structure during an emergency situation.
Visual signaling devices used to attract attention during emergencies, typically launched into the air to produce a bright, colorful display.
A distress beacon designed to transmit a distress signal to satellite systems, providing a precise location for search and rescue purposes. EPIRBs are typically used on vessels and aircraft in emergency situations.
A comprehensive plan developed by authorities or vessel operators to address emergencies and outline procedures, responsibilities, and actions to be taken in various emergency scenarios, including rescue operations.
A team of trained personnel responsible for coordinating and implementing emergency response measures during maritime incidents.
Emergency Stretcher
Emergency Towage
Emergency Towing Vessel (ETV)
Emission Control Areas (ECAs)
Endeavour
Energy Efficiency Design Index (EEDI)
Engine Room
Engineer Officer
Environmental Compliance
Environmental Education and Outreach
Environmental Management System (EMS)
Ephemeris Data
EPIRB (Emergency PositionIndicating Radio Beacon)
Erik the Red (950-1003)
Escrow
Excess Insurance
Exclusive Economic Zone (EEZ)
Exclusive Listing
Exhaust System
Expedition Yacht
Explorer Yacht
A specially designed stretcher used for the safe transport of injured individuals during rescue operations.
The provision of towing services to vessels in distress or experiencing propulsion failures. Emergency towage vessels assist disabled ships, preventing them from drifting or running aground.
A dedicated vessel equipped with towing capabilities and resources for assisting ships in distress or preventing environmental damage.
Designated sea areas in which stricter controls were established to minimize airborne emissions from ships as per Annex VI.
British research vessel captained by James Cook during his first voyage, instrumental in the exploration of the Pacific and discovery of Australia.
An index that measures a ship's theoretical CO2 emission per transport work, which is a function of the ship's size and speed. It was implemented under amendments to Annex VI of MARPOL.
The compartment where the ship's prime mover (engine) and auxiliary engines are located.
A member of the ship's crew involved in maintaining and operating the propulsion plants and support systems on board merchant vessels.
Ensuring that a marina operates in compliance with applicable environmental laws, regulations, and permits to prevent pollution and protect natural resources.
Programs and initiatives aimed at raising awareness among marina users and staff about environmental issues, pollution prevention, and sustainable boating practices.
A systematic approach to managing environmental impacts and promoting sustainability within a marina. It includes policies, procedures, and practices to minimize pollution and protect the environment.
Precise orbital information for each satellite in a GPS constellation, including its position, velocity, and clock offset. This data is used by GPS receivers to calculate accurate positions.
A device used to alert search and rescue services in the event of an emergency by transmitting a coded message on the 406 MHz distress frequency via satellite and earth stations to the nearest rescue coordination center.
Norse explorer who is credited with founding the first Norse settlements in Greenland and playing a significant role in Viking exploration.
A financial arrangement where funds or documents related to a vessel transaction are held by a neutral third party until specified conditions are met.
Additional coverage above the primary insurance limit.
An area beyond a coastal state's territorial waters where it has special rights over the exploration and use of marine resources.
An agreement between a vessel owner and a broker that grants the broker exclusive rights to market and sell the vessel within a specified timeframe.
The system that collects and channels exhaust gases from the marine diesel engine to the outside, often including components like exhaust manifolds, mufflers, and silencers.
Similar to an explorer yacht, built for adventurous journeys with scantlings and equipment for remote operation unsupported.
A yacht designed for long-range cruising and venturing into remote or challenging regions, equipped with
Export Declaration
Export Duty
Export License
Express Yacht
Extreme Sailing Series
Eye of the Storm
Eye Splice
Fail-Safe
robust systems for extended voyages.
A document that provides information about the goods being exported, including their nature, value, and destination.
A tax or tariff imposed on goods that are exported out of a country. The duty is typically based on the value or quantity of the goods.
A permit or authorization issued by the customs authorities or relevant government agency that grants permission to export specific goods out of a country.
A sleek and fast motor yacht designed for quick cruising, often characterized by a sporty appearance.
A global sailing circuit that features high-speed, short-course racing in foiling catamarans. The series brings together top international sailors in thrilling and spectator-friendly stadium-style venues.
The calm region at the center of a storm.
A type of splice that creates a permanent loop or eye at the end of a rope.
A feature designed to automatically put a device or system in a safe mode in the event of a power outage, equipment failure, or other malfunction.
Fairing
Fairlead
False Alert
Fast Ice
Fastnet Race
Fathom
FCL (Full Container Load)
Fender
Fenders
Ferdinand Magellan (14801521)
Ferry
Fetch
Fid
Fiddle Block
Figure Eight
Finish Line
Fins
Fire and Safety Inspection
Firefighting Equipment
Fisheries Management
Fishing Vessel
Fix
The process of smoothing the hull to ensure it is free of dips and bumps before it is painted. It can also refer to the application of a filler to smooth the surface or cover joints in the hull structure.
A device used to guide a line, rope or cable around an object, out of the way or to stop it from moving laterally.
A distress alert that was transmitted without any need for immediate assistance.
Sea ice that forms along coasts and extends out into the sea. It is attached ("fastened") to the shore, and does not move with the wind or currents.
A biennial offshore race organized by the Royal Ocean Racing Club (RORC). It starts in Cowes, Isle of Wight, and takes competitors around the Fastnet Rock off the southwest coast of Ireland before finishing in Plymouth, UK.
A unit of length equal to six feet, used to measure the depth of water.
A shipment that occupies the entire capacity of a container, typically belonging to a single shipper.
A cushioning device made of rubber or other materials used to protect the hull of a vessel from damage during berthing or docking.
Cushions placed between boats or between a boat and a pier to prevent damage.
Portuguese explorer who led the first circumnavigation of the Earth, proving that the world was round and significantly expanding global knowledge of geography.
A type of vessel used for the transport of passengers, vehicles, and sometimes cargo across a waterway, typically on a regular schedule.
The distance over water that the wind blows in a single direction.
A pointed tool used in marine ropework for tasks such as splicing ropes.
A type of block (pulley) which has two or more sheaves of different sizes in the same unit. Often used in combination with another block for a mechanical advantage in a tackle.
A knot used to create a stopper knot at the end of a rope or to create a loop in the middle of a line.
The line between two markers that marks the end of the race, where yachts must cross to complete the race.
Equipment worn on the feet to provide propulsion and maneuverability underwater.
An inspection conducted by the U.S. Coast Guard to verify compliance with fire prevention and safety regulations, including firefighting equipment, emergency escape routes, and life-saving appliances.
Specialized equipment, such as fire extinguishers, hoses, and fire suppression systems, used to combat and control fires on board a vessel.
The regulation and control of fishing activities, including catch limits, conservation measures, and protection of marine resources.
A boat or ship used for commercial or recreational fishing activities, equipped with facilities and gear for catching and storing fish.
A position determined without reference to any previous position, often by using two or more navigational
Fixed-Pitch Propeller
Flag State
Flag State Administration
Flag State Approval
Flag State Audit
Flag State Authority
aids or methods.
A marine propeller with a fixed blade angle, offering simplicity and reliability but limited adjustability for different operating conditions.
The country or jurisdiction under whose laws a ship is registered and flies its national flag.
The government authority responsible for the registration, regulation, and oversight of ships under its flag.
Authorization granted by the flag state administration for specific activities, equipment, or procedures on board a ship, indicating compliance with flag state requirements.
An assessment conducted by the flag state administration to evaluate its own performance and compliance with international standards.
The designated organization or agency within the flag state administration responsible for overseeing the implementation and enforcement of flag state requirements.
Flag State Circulars Official communications or guidelines issued by the flag state administration to provide guidance and interpretation of flag state requirements.
Flag State Compliance
Flag State Control (FSC)
Flag State Control Memorandum of Understanding (MoU)
Flag State Control Officer
Flag State Convention Implementation
Flag State Enforcement
Flag State Inspection
Flag State Inspector
Flag State Inspectorate
Flag State Investigation
Flag State Jurisdiction
Flag State Liability
Flag State Registry
The state of adherence and conformity of a ship, its operations, and its crew to flag state requirements and international conventions.
The system of inspections and surveys conducted by the flag state administration to ensure compliance with international maritime conventions and regulations.
An agreement between flag state administrations to cooperate and harmonize their efforts in conducting flag state control inspections.
An authorized official appointed by the flag state to conduct inspections and enforce regulations on its behalf.
The process by which the flag state administration adopts and enforces international conventions and regulations within its national legislation.
The measures and actions taken by the flag state administration to ensure compliance with its regulations, including the imposition of penalties or sanctions for non-compliance.
An inspection conducted by the authorities of the flag state to ensure compliance with national and international regulations.
An authorized representative of the flag state administration who conducts inspections and surveys on ships to verify compliance with flag state requirements.
A specialized division or department within the flag state administration that carries out inspections, surveys, and audits on ships.
An inquiry or examination conducted by the flag state administration into an incident, accident, or violation involving a ship registered under its flag.
The legal authority and responsibility of the flag state administration over its registered ships, regardless of their location.
The legal responsibility of the flag state administration for the actions or omissions of its registered ships, including liabilities arising from accidents, pollution, or non-compliance with regulations.
The official record or database maintained by the flag state administration that lists the registered ships flying its flag.
Flag State Report
Flag State Requirements
Flank Speed
Floating Crane
Floating Dock
Floating Production, Storage, and Offloading (FPSO) Vessel
Floe
Flood Tide
Fluke
Flybridge
Flybridge Yacht
Fog
Foot
Force 12
Fore
Foresail
Forestay
Forestay (or Headstay)
Frames
Frazil Ice
Free Port
Freeboard
Freight Forwarder
Freight Insurance
A document issued by the flag state administration certifying that a ship complies with applicable flag state requirements and international conventions.
The rules, regulations, and standards set by the flag state administration for the construction, operation, and maintenance of ships under its flag.
The maximum speed of a ship.
A crane mounted on a barge or vessel used for heavy lifting and salvage operations on the water.
A type of drydock that consists of a floating platform or pontoon structure that can be submerged to allow a vessel to enter, and then raised to lift the vessel out of the water for inspection and repairs.
A ship-shaped offshore facility used in the production and processing of oil and gas, with storage capabilities.
A flat, floating piece of ice that can range in size from small chunks to large ice islands.
The incoming or rising tide, occurs between low tide and high tide.
The part of the anchor that digs securely into the bottom holding the boat in place.
A secondary control station located on the upper deck of a yacht, usually fully equipped with navigational and engine controls. It often includes seating and sometimes dining or sunbathing areas.
A motor yacht featuring an additional deck above the main deck, offering additional seating, navigation equipment, and open-air views.
A visible aerosol consisting of tiny water droplets suspended in the atmosphere at or near the Earth's surface.
The bottom edge of a sail.
Term used in the Beaufort scale to refer to hurricane force winds.
Towards the front of the boat.
A sail set forward of the mast. On a sloop, this usually refers to the jib or genoa.
The cable or wire that supports the mast from the front, helping to control the mast's fore-and-aft movement.
A support or stay running from the top of the mast to the bow of the boat.
Structural elements within a boat that run athwartship (from side to side) to give the boat its shape and provide structural integrity.
Fine spicules or plates of ice, suspended in water, typically formed in turbulent water.
A Zone created such that acyivities within the Free Prot are conducted free of customs duties provided the end product is re exported
The distance from the waterline to the deck level of a ship.
A company or agent that arranges the transportation of goods on behalf of the charterer or shipper, coordinating logistics, documentation, and customs clearance.
Coverage for the value of the freight being transported.
Freight Rate
Fresh Water Generator
Frigate
Front
Frostbite
Fuel Oil Non-Availability Report (FONAR)
Fuel Polishing
Fuel Spill Response Plan
Fueling Dock
Fueling Station
Full Keel
Furl
The price charged for the transportation of cargo from one location to another, usually based on factors like distance, weight, and shipping route.
Equipment used on a ship to convert seawater into drinkable fresh water.
A medium-sized warship, larger than a corvette but smaller than a destroyer, typically used for escort duties and anti-submarine warfare.
The boundary between two different air masses, often leading to changes in the weather.
Injury caused to body tissues due to freezing, a common risk in high latitude sailing due to low temperatures.
A report that a ship may submit if it cannot obtain compliant fuel oil.
The process of cleaning fuel by removing water, sediment, and microbial contamination.
A plan implemented by marinas to respond to fuel spills and minimize the environmental impact. It includes procedures for containment, cleanup, and reporting.
A designated area within a marina where boats can refuel with gasoline, diesel, or other types of fuel. Fueling docks should adhere to safety and environmental regulations to prevent fuel spills or leaks.
A facility within a marina that provides fuel, pumps, and other equipment for boats to refuel.
A keel that runs the entire length of the boat. Full keels have a shallower draft and are more stable, offering better straight-line tracking and protection for the propeller and rudder.
To roll or fold up a sail securing it to its main support (usually the boom).
Gaff
Gale
Gale Warning
Galley
Garbage Management Plan
Gel Battery
General Average
Gennaker
Genoa
Genoa Cars
Geodetic Datum
Geographical Position (GP)
Gimbal
Give-way Vessel
Glacial Moraine
Glacial Striation
A type of spar attached to the mast and used to extend the top of a four-sided, fore-and-aft sail.
A very strong wind, defined by the U.S. National Weather Service as ranging from 34 to 47 knots.
A warning of 1-minute sustained surface winds in the range 34 knots (39 mph or 63 kph) to 47 knots (54 mph or 87 kph) inclusive, either predicted or occurring and not directly associated with tropical cyclones.
The kitchen area on a boat.
A written plan that provides guidance to the crew of a ship on the procedures for the collecting, storing, processing, and disposing of garbage, as per MARPOL Annex V.
A type of sealed lead-acid battery that uses a gel electrolyte, offering improved safety, vibration resistance, and longer service life compared to traditional flooded lead-acid batteries.
A principle of marine insurance where all parties share losses in proportion to their interests.
A type of sail that is known for being a hybrid between a genoa and a spinnaker. It is used when sailing downwind and is designed to bridge the performance gap between these two types of sails.
A large foresail that overlaps the main sail, sometimes called a Genoa jib.
Adjustable fittings or tracks on the deck or side of a boat that allow for proper positioning and adjustment of the genoa sail.
A reference system used to define the position of points on the Earth's surface. It provides a consistent framework for mapping, surveying, and GPS positioning.
The latitude and longitude coordinates of a vessel's position, as determined by a GPS or satellite navigation system.
A pivoted support that allows an object (such as a ship's compass or stove) to remain horizontal while the boat tilts.
The vessel that is required to take early and substantial action to keep well clear of the stand-on vessel. (COLREGS)
Accumulations of dirt and rocks that have been left behind by a moving glacier.
Scratches or gouges cut into bedrock by glacial abrasion.
Glacier A slowly moving mass of ice formed by the accumulation and compaction of snow on mountains or near the poles.
GMDSS (Global Maritime Distress and Safety System)
Golden Globe Race
Golden Hind
Gooseneck
An internationally agreed-upon set of safety procedures, types of equipment, and communication protocols used to increase safety and make it easier to rescue distressed ships, boats and aircraft.
A solo, non-stop, round-the-world yacht race that pays tribute to the original 1968-1969 Golden Globe Race. Participants use only technology available during that era and sail in traditional long-keel yachts.
English galleon captained by Sir Francis Drake during his circumnavigation, representing England's naval power during the Elizabethan era.
The swivel connection between the boom and the mast.
Governor A device that regulates the speed and output power of a marine diesel engine by controlling the amount of fuel delivered to the engine.
GPH (Gallons Per Hour)
GPS (Global Positioning System)
GPS Augmentation Systems
GPS Week Number Rollover
Grapnel Anchor
Graving Dock
Grease Ice
Grey Water
Gross Tonnage (GT)
Growler
Gybing
Gyrocompass
Gyroscope
A unit of measurement for fuel consumption in boats.
A satellite-based navigation system that provides precise location and time information anywhere on Earth. It relies on a network of satellites, ground-based receivers, and onboard GPS receivers to determine accurate positions.
Additional systems or techniques used to improve the accuracy, integrity, or availability of GPS positioning, such as Wide Area Augmentation System (WAAS), European Geostationary Navigation Overlay Service (EGNOS), or Ground-Based Augmentation System (GBAS).
An event that occurs every 1,024 weeks (approximately every 19.7 years) when the GPS week counter resets to zero. It requires careful handling and software updates to avoid date-related issues in GPS receivers.
A small, lightweight anchor with multiple tines or hooks that is often used for small boats or as a temporary or emergency anchor.
A type of drydock that is a narrow, rectangular basin with gates at one end. When the gates are closed, water is pumped out, allowing the vessel to rest on blocks or keel blocks for inspection and repairs.
A very thin layer of smooth, matte-like ice without enough strength to support any weight.
Wastewater generated from sinks, showers, and other non-toilet sources onboard vessels. It typically does not contain significant amounts of harmful contaminants and can be treated or discharged in accordance with regulations.
A measurement of a vessel's total internal volume, including all enclosed spaces, calculated in accordance with the International Convention on Tonnage Measurement of Ships. It is used for administrative, regulatory, and safety purposes.
Small icebergs less than 1 meter (3 feet) above the sea surface and an overall height of 5 meters (16 feet).
Changing the direction of the yacht's course by turning the stern through the wind, typically used when sailing downwind.
A navigational instrument that uses the Earth's rotation to provide a stable and accurate reference for determining a vessel's heading.
A device that uses Earth's gravity to help determine orientation.
Halyard
A rope or line used to hoist and lower sails or flags on a mast.
Halyard (or Halliard) A line (rope) that is used to hoist a sail or a flag.
Halyard Lock
Harbor Master
Hard Chine Hull
Hardening
A device or mechanism used to hold a halyard in a specific position, preventing slippage or unintended release.
An official responsible for the management and regulation of vessel traffic within the port, ensuring safe navigation and berthing.
A hull form with distinct, angular chines where the hull sides meet the bottom, offering stability and a larger interior space.
Pulling in a line or sheet, making the sail flatter.
Hatch An opening in a ship's deck fitted with a watertight cover.
Hatch Inspection
Hawser
Hazardous Material (HazMat) Certification
Hazardous Materials
An examination of a ship's cargo hatches to ensure their structural integrity and watertightness.
A large rope used for mooring or towing a vessel.
A certification required for maritime professionals responsible for the handling and transportation of hazardous materials.
Substances that pose a threat to human health, safety, or the environment, which may require specialized handling during salvage operations.
Head The bathroom on a boat.
Head-on Situation
Heading
Headsail
Health Certificate
Heave
A situation in which two vessels are approaching each other in such a manner that there is a risk of collision if neither takes action. (COLREGS)
The direction a vessel's bow points at any given time.
Any sail forward of the main mast(s) of a sailing vessel.
A document issued by a competent authority, such as a public health agency, certifying the health status of a vessel, crew, passengers, or cargo. It may be required for customs clearance or entry into a port.
The linear vertical (up/down) motion; excessive downward heave can swamp a ship.
Heave To To bring a sailing ship to a standstill, also a maneuver used in heavy winds.
Heaving Line
Heaving-to
Heavy Fuel Oil (HFO)
Heeling
A light line used to throw between a boat and the dock, to which a heavier line can be attached for pulling.
A way of slowing a sailboat's forward progress, used in heavy weather.
A type of fuel used in ship engines. It is highly viscous and contains a high amount of sulphur.
The leaning over of a sailing boat due to the action of the wind on the sails.
Helicopter Rescue Rescue operations conducted by helicopters, often used for swift response and evacuation in remote or inaccessible areas.
Helm The wheel or tiller controlling the rudder.
Hernán Cortés (1485-1547) Spanish conquistador who led the expedition that resulted in the fall of the Aztec Empire in Mexico.
HFO
High Pressure System
High Seas
High Tide (or High Water)
High Voltage (HV) Certificate
High-Risk Area (HRA)
Hijacking
Hinterland
HMS Beagle
Heavy Fuel Oil - A type of fuel commonly used in marine engines, characterized by its high viscosity and density, requiring specialized handling and treatment.
An area where the atmospheric pressure is higher than the surrounding area, often associated with clear, calm weather.
Areas of the open ocean beyond the territorial waters of any country, where international laws and treaties apply.
The state of the tide when it is at its highest level and has reached its peak.
A certificate required for seafarers working onboard vessels equipped with high voltage systems.
A designated geographic region where the risk of piracy or armed robbery against ships is considered significant. These areas often have increased security measures and recommendations for vessel operators.
The unlawful seizure and control of a ship by pirates, often with the intent of stealing cargo or holding the crew for ransom.
The inland area served by a port, encompassing the region where cargo is transported to and from the port by various modes of transportation.
British ship that carried Charles Darwin on his famous voyage, leading to his groundbreaking work on evolution and natural selection.
HMS Bounty Replica of the original Bounty, famous for its appearances in films such as Mutiny on the Bounty.
HMS Victory British naval ship that served as Admiral Nelson's flagship during the Battle of Trafalgar in 1805, now a museum ship in Portsmouth, England.
HMS Warrior British iron-hulled warship, the first ironclad battleship, representing a major advancement in naval technology in the mid-19th century.
Holding Power
Holding Tank
Hospital Ship
Hostage Negotiation
Hub
Hull
Hull and Structural Inspection
Hull Insurance
Hull Speed
The ability of an anchor to resist dragging and keep a vessel securely in place.
A tank onboard a vessel used to store and contain black water or other wastewater until it can be properly discharged or treated.
A ship equipped with medical facilities and staff to provide healthcare services, humanitarian aid, or disaster relief in coastal areas or conflict zones.
The process of negotiating with pirates or hijackers to secure the release of hostages or the safe resolution of a piracy incident. This typically involves trained negotiators, communication channels, and compliance with international laws and guidelines.
The central part of a marine propeller that connects the blades and transfers rotational force from the propeller shaft to the blades.
The watertight body of a yacht, excluding the superstructure.
An inspection conducted by the U.S. Coast Guard to assess the structural integrity, condition, and maintenance of a vessel's hull, superstructure, and related components.
Coverage for damage to the vessel's hull and machinery.
The maximum speed a ship can theoretically achieve based on the length of its hull.
Hull Survey
Hurricane/Cyclone/Typhoon
A survey that focuses on the structural integrity, condition, and maintenance of a ship's hull, including the hull plating, framing, corrosion protection, and watertight integrity.
A tropical cyclone in which the maximum sustained surface wind is 64 knots (74 mph or 119 kph) or more. The term used depends on the region (hurricane in the North Atlantic and Northeast Pacific, typhoon in the Northwest Pacific, and cyclone in the South Pacific and Indian Ocean).
Hybrid Drive
Hydrographic Office
Hydrographic Survey
Hydrography
A propulsion system that combines two or more power sources, such as an internal combustion engine and an electric motor, for increased efficiency and reduced emissions.
Government or institutional body responsible for the production and distribution of nautical charts, publications, and hydrographic services.
The process of collecting data on the physical characteristics of water bodies to create accurate charts and navigational information.
The science and study of measuring and describing the physical features of bodies of water, including depth, tides, currents, and underwater terrain.
IBIA (International Bunker Industry Association)
Ice Anchor
Ice Blink
Ice Canopy
Ice Chart
Ice Class
Ice Drift
Ice Floe
Ice Navigation
Ice Pilot
Ice Pilotage
Ice Radar
Ice Shelf
Iceberg
Icebreaker
IMarEST (Institute of Marine Engineering, Science & Technology)
IMO (International Maritime Organization)
Import Declaration
Import Duty
Import License
An international association representing the interests of the bunker industry, including bunker suppliers, traders, and service providers.
A heavy anchor designed to secure a vessel in ice-covered waters, providing stability and preventing drifting.
A yellowish luminosity near the horizon or on the underside of a cloud, caused by the reflection off a field of ice.
The overhead covering of ice, typically referring to the under-side of sea ice or ice shelves.
A specialized chart that provides information on the extent and concentration of ice in a particular area, aiding navigators in route planning and avoiding ice hazards.
A classification assigned to ships that indicates their suitability for navigating in ice-covered waters, with higher ice classes indicating greater ice-strengthening features.
The movement of ice due to wind, currents, and other factors, which can affect ship navigation and route planning.
Any free-floating piece of sea ice that is greater than 20 meters across.
The skill and practice of safely maneuvering a vessel through ice-covered waters, often requiring specific equipment, training, and knowledge of ice behavior.
An experienced navigator with specialized knowledge and expertise in navigating through ice-infested waters.
The service provided by experienced ice pilots who guide ships through ice-infested waters, providing valuable local knowledge and navigation assistance.
Specialized radar equipment used to detect and track ice features, such as icebergs and ice floes, for safe navigation.
A thick, floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface.
A large piece of freshwater ice that has broken off a glacier or an ice shelf and is floating freely in open water.
A special-purpose ship or boat designed to move and navigate through ice-covered waters, providing safe waterways for other boats and ships.
A professional membership body that focuses on the advancement and promotion of marine engineering, science, and technology.
A specialized agency of the United Nations responsible for regulating shipping.
A document that provides information about the goods being imported, including their origin, value, and intended use.
A tax or tariff imposed on goods that are imported into a country. The duty is typically based on the value or quantity of the goods.
A permit or authorization issued by the customs authorities or relevant government agency that grants
Importer of Record
In Irons
In-Water Survey
Inboard Engine
Incoterms
Injector
Inland Waterway
Inmarsat
Institute Cargo Clauses (A, B, C)
Institute Time Clauses (Hulls)
Institute Warranties
Intermediate Survey
Intermodal Transportation
International 14
International Air Pollution Prevention (IAPP) Certificate
International Association of Classification Societies (IACS)
International Association of Dry Cargo Shipowners (INTERCARGO)
International Association of Ports and Harbors (IAPH)
International Bunker Industry Association (IBIA)
permission to import specific goods into a country.
The entity responsible for ensuring that imported goods comply with customs regulations and paying any applicable duties or taxes.
The position of a sailboat with its bow directly into the wind, preventing the sails from filling properly and the boat from moving.
An inspection of a ship's underwater hull and fittings while the vessel is afloat.
An engine installed inside the hull of a vessel, typically connected to a shaft that drives a propeller.
International commercial terms that define the responsibilities and obligations of buyers and sellers in international trade, including terms like FOB, CIF, and EXW.
A device that injects fuel into the combustion chamber of a marine diesel engine at the precise moment for efficient and controlled combustion.
A navigable river, canal, or lake used for the transportation of cargo between ports and inland destinations.
A British satellite telecommunications company, offering global mobile services via portable or mobile terminals.
Standardized clauses that define the coverage and terms of cargo insurance.
Standardized clauses that define the coverage and terms of hull insurance.
Specific conditions that must be met for insurance coverage to remain in force.
A survey conducted between two periodic surveys to assess a ship's condition and maintenance requirements.
The movement of cargo using multiple modes of transportation, such as combining sea, rail, and trucking services for efficient delivery.
A high-performance, two-person, trapeze dinghy known for its speed, planing capabilities, and advanced sailing techniques. The International 14 class is popular among skilled sailors seeking exhilarating racing experiences.
A certificate which certifies that the equipment and material on the ship is in accordance with Annex VI of the International Convention for the Prevention of Pollution from Ships (MARPOL).
An organization comprising major classification societies that establish and uphold technical standards for ships and marine structures.
An association representing the interests of dry bulk shipowners and operators, promoting safe, efficient, and environmentally sound shipping practices.
An organization that promotes cooperation and exchange of information among ports worldwide, addressing common challenges and facilitating sustainable development.
An international trade association which represents the interests of companies involved in the supply of marine fuel.
International Certificate of A document issued to individuals who have received certain vaccinations or medical prophylaxis, such as
Vaccination or Prophylaxis (ICVP) for yellow fever, as required by international health regulations for travel to certain countries.
International Chamber of Commerce (ICC)
International Chamber of Shipping (ICS)
International Code Flag
International Convention for the Control and Management of Ships' Ballast Water and Sediments (BWM)
International Convention for the Prevention of Pollution from Ships (MARPOL)
International Convention for the Safety of Life at Sea (SOLAS)
International Convention on Civil Liability for Bunker Oil Pollution Damage (BUNKER)
International Convention on Civil Liability for Oil Pollution Damage (CLC)
International Convention on Liability and Compensation for Damage in Connection with the Carriage of Hazardous and Noxious Substances by Sea (HNS)
International Convention on Load Lines (LL)
International Convention on Salvage (SALVAGE)
International Convention on Standards of Training, Certification and Watchkeeping for Fishing Vessel Personnel (STCW-F)
International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW)
A global business organization that provides a platform for businesses to shape international trade policies and resolve disputes.
The principal international trade association for shipowners, representing national shipowners' associations and promoting maritime policy and regulation.
A set of flags representing the letters of the alphabet, numerals, and special signals, used for communication and identification purposes.
Sets standards and requirements for the management and treatment of ballast water to prevent the transfer of invasive aquatic species.
An international treaty that sets standards for the prevention of marine pollution from ships, covering various aspects such as oil, sewage, and air emissions.
An international treaty that sets minimum safety standards for the construction, equipment, and operation of ships.
Establishes liability and compensation procedures for pollution damage caused by spills of bunker oil.
Provides a framework for compensation and liability for oil pollution damage caused by oil tankers.
Establishes a regime for liability and compensation for damage caused by the carriage of hazardous and noxious substances by sea.
Establishes mandatory load line requirements to ensure the safety and stability of ships, taking into account factors such as the ship's size, construction, and operating conditions.
Provides a legal framework and procedures for salvaging ships and their cargo in cases of accidents, emergencies, or distress situations at sea.
Applies the STCW requirements to personnel on fishing vessels to ensure their competency, safety, and well-being.
Establishes minimum training, certification, and watchkeeping standards for seafarers to ensure competence and safety at sea.
International Convention on Regulates the use of anti-fouling systems on ships to prevent the release of harmful substances into the
the Control of Harmful Antifouling Systems on Ships (AFS) marine environment.
International Convention on the Control of Harmful Organisms and Pathogens in Ballast Water and Sediments (BWM)
International Convention on Tonnage Measurement of Ships (ITC)
International Garbage Pollution Prevention Certificate
International Group of P&I Clubs
International Health Regulations (IHR)
International Hydrographic Organization (IHO)
International Labour Organization (ILO)
International Load Line Certificate (ILLC)
International Marine Contractors Association (IMCA)
International Maritime Bureau (IMB)
International Maritime Law Institute (IMLI)
International Maritime Organization (IMO)
International Maritime Rescue Federation (IMRF)
International Moth Class
International Naval Task Force
International Oil Pollution
Sets standards for the control and management of harmful organisms and pathogens in ballast water and sediments.
Establishes a uniform system for measuring the tonnage of ships to determine factors such as fees, port dues, and obligations under various international conventions.
A certificate which certifies that the ship is in compliance with regulations to prevent pollution by garbage, as per Annex V of MARPOL.
An association of thirteen mutual insurance clubs providing Protection and Indemnity (P&I) insurance to shipowners, covering liabilities not typically covered by hull and machinery insurance.
A set of regulations issued by the World Health Organization (WHO) that provide a framework for preventing and responding to the international spread of diseases. They guide port health authorities in managing health risks associated with international maritime travel.
An intergovernmental organization that sets international standards and promotes cooperation among hydrographic offices worldwide.
A United Nations agency that sets and promotes international labor standards, including those related to maritime labor and seafarer welfare.
A certificate issued to a vessel in compliance with the International Convention on Load Lines, confirming that the vessel has been surveyed and complies with the applicable load line regulations.
An international trade association representing offshore, marine, and underwater engineering companies.
An international organization that serves as a focal point for collecting and disseminating information related to piracy, armed robbery, and other maritime crimes. It operates a Piracy Reporting Centre to assist vessels in reporting incidents and provides advice on piracy prevention.
An international educational institution affiliated with the IMO, offering postgraduate education and research in international maritime law.
The United Nations specialized agency responsible for the safety, security, and environmental performance of international shipping.
An international organization that brings together maritime search and rescue organizations, professionals, and volunteers. The IMRF promotes collaboration, knowledge sharing, and best practices in maritime rescue operations.
A high-performance, foiling dinghy known for its speed and innovation. The International Moth class pushes the boundaries of sailing technology with its use of hydrofoils and advanced design concepts.
A multinational force composed of naval assets from various countries, established to conduct counterpiracy operations in high-risk areas. These task forces provide security and support to merchant vessels and coordinate anti-piracy efforts.
International funds that provide compensation to victims of oil pollution incidents from ships, established
Compensation Funds (IOPC Funds) under the International Convention on Civil Liability for Oil Pollution Damage (CLC) and the Fund Convention.
International Organization for Standardization (ISO)
International Safety Management (ISM) Code
International Safety Management Code (ISM)
International Sewage Pollution Prevention (ISPP) Certificate
International Ship and Port Facility Security Code (ISPS)
International Tanker Owners Pollution Federation (ITOPF)
International Tonnage Certificate (ITC)
International Transport Workers' Federation (ITF)
International Tribunal for the Law of the Sea (ITLOS)
International Union of Marine Insurance (IUMI)
An independent, non-governmental organization that develops and publishes international standards, including those relevant to the maritime industry, such as ISO 9001 (quality management) and ISO 14001 (environmental management).
A set of regulations for the safe management and operation of ships, including requirements for safety management systems and crew training.
Requires shipping companies to establish and implement a safety management system to ensure the safe operation of ships and prevent accidents, injuries, and pollution.
A certificate required under Annex IV of MARPOL, which certifies that the ship is equipped with a sewage treatment plant or comminuting and disinfecting system or a sewage holding tank.
Sets out security measures to enhance the security of ships and port facilities against potential threats and acts of terrorism.
An organization providing expertise and technical advice on oil and chemical spills from tankers, supporting effective response and pollution prevention.
A certificate issued to a vessel in accordance with international regulations, such as the International Convention on Tonnage Measurement of Ships, confirming the vessel's tonnage measurement and compliance.
A global trade union federation representing workers in the transportation sector, including seafarers, advocating for their rights, welfare, and fair working conditions.
A judicial body established by the United Nations Convention on the Law of the Sea (UNCLOS) to resolve disputes related to maritime law.
An organization representing the global marine insurance industry, promoting best practices, research, and knowledge sharing.
International Waters Areas of the ocean that are beyond the jurisdiction of any particular country, also known as the high seas.
Inversion
Isabelle Autissier
A deviation from the normal change of an atmospheric property with altitude. It almost always refers to a temperature inversion.
French sailor and the first woman to complete a solo circumnavigation of the globe via the Southern Ocean in the BOC Challenge race.
Isobar A line on a weather map connecting points of equal atmospheric pressure.
Isobath A line on a map that connects points of equal depth below the water surface.
Isogonic Lines
ISPS Code
Lines on the Earth's surface along which the declination of the Earth's magnetic field is constant.
International Ship and Port Facility Security Code - A comprehensive set of measures to enhance the security of ships and port facilities against security threats and potential terrorist attacks.
Jacques Cousteau (19101997)
James Cook (1728-1779)
Jet Drive
Jet Stream
Jib
Jib Furler
Jib Sheet
Jibe (or Gybe)
Jibsheet
Joystick Control
Jules Verne Trophy
Junk
French naval officer, explorer, and conservationist who co-developed the Aqua-Lung and pioneered marine conservation through his extensive exploration of the world's oceans.
British explorer and navigator who made three voyages to the Pacific Ocean, mapping many areas and making numerous scientific discoveries.
A propulsion system that uses a jet of water expelled at high speed through a nozzle to generate thrust, commonly used in smaller vessels or personal watercraft.
A narrow band of high-speed winds in the atmosphere that can steer atmospheric currents and affect weather patterns.
A triangular staysail set forward of the mast.
A device used to furl or roll the jib sail, making it easier to handle and stow.
The line used to control the position of the jib sail relative to the wind.
A sailing maneuver whereby a sailing vessel reaching downwind turns its stern through the wind, such that the wind direction changes from one side of the boat to the other.
The line used to control the angle and tension of the jib or headsail.
A manual control method for DP systems, where the operator can control the vessel's speed, course and rotation.
A prize awarded to the fastest circumnavigation of the world by any type of yacht, with no restrictions on crew or stops. The trophy is named after the French author Jules Verne, who wrote about fictional voyages around the world.
A traditional Chinese sailing ship with multiple masts and battened sails, commonly used in East Asian waters.
K Band Radar
Ka Band Satellite Communications
Kedge Off
Keel
Ketch
King Tide
Knot
Knot (nautical)
Knot (speed)
Kort Nozzle
Ku Band Satellite Communications
Operates in the frequency range between 18 and 27 GHz, offering higher resolution and improved target discrimination, making it suitable for short-range applications.
Ka band operates in the frequency range between 26.5 and 40 GHz, providing even higher data rates and larger bandwidth, suitable for high-capacity broadband services, including high-definition video streaming and data-intensive applications.
The use of a kedge anchor to move a ship off a shoal or away from some other proximity.
The primary structural basis of a boat's hull, designed to prevent sideways drift and provide stability to the vessel.
A two-masted sailboat, the mizzen mast (the shorter) being set forward of the rudder post.
Non-scientific term used to describe the highest seasonal tides that occur each year.
A unit of speed used in aviation and marine contexts, equal to one nautical mile per hour.
A measure of speed in nautical miles per hour.
A unit of speed in aviation and marine contexts, equal to one nautical mile per hour.
A hydrodynamic device installed around a ship's propeller to improve its efficiency and maneuverability, commonly used on tugboats.
Ku band operates in the frequency range between 12 and 18 GHz, offering a higher data rate and more available bandwidth, commonly used for direct broadcast satellite services, broadband internet access, and maritime communications.
L Band Satellite Communications
Land Breeze
Lanyard
Laser Dinghy
Latitude
Launch
Laycan
Laytime
Lazarette
Lazy Jacks
LCL (Less than Container Load)
Lead
Lead Acid Battery
Leads or Ice Leads
Lee Shore
Leech
Leeward
Legal Framework against Piracy and Terrorism
Letter of Intent (LOI)
Life Raft
Lifeboat
Lifejacket
L band operates in the frequency range between 1 and 2 GHz, providing reliable global coverage and suitable for mobile and handheld satellite communications.
A breeze blowing toward the sea from the land, especially at night, owing to the relative warmth of the sea.
A short rope used for fastening rigging.
A popular one-design sailing dinghy that is widely used for both recreational sailing and competitive racing. The Laser class is known for its simplicity, accessibility, and large worldwide fleet.
The distance north or south of the equator measured in degrees. It ranges from 0 degrees at the Equator to 90 degrees at the poles.
The process of putting a newly constructed ship into the water for the first time.
The agreed range of dates during which the vessel is expected to be available for loading or unloading at the specified port.
The period of time allowed for loading or unloading cargo as specified in the charter party.
A storage space in a boat's stern area.
A system of lines and blocks that is used to guide a sail onto the boom when it's lowered.
A shipment that does not fill an entire container, with multiple shipments consolidated into a single container for cost efficiency.
A narrow channel or open water passage through ice, allowing ships to navigate through ice-covered areas.
A common type of battery that uses lead plates and sulfuric acid as electrolyte, offering a reliable and costeffective solution for marine applications.
Navigable passages between ice floes.
A shore downwind of a ship. A ship that cannot sail well to windward risks being driven onto a lee shore and grounded.
The aft (back) edge of a fore-and-aft sail; the leeward edge of a spinnaker; the trailing edge of a windsurfing sail.
The direction downwind from the point of reference. The opposite of windward.
The national and international laws, conventions, and agreements that govern the prosecution, investigation, and punishment of individuals involved in piracy and terrorism at sea. This includes United Nations conventions, regional agreements, and domestic legislation.
A non-binding document that outlines the basic terms and conditions agreed upon by the buyer and seller, expressing their intention to proceed with a vessel transaction.
An inflatable raft designed to accommodate a group of people in emergency situations. Life rafts are carried onboard ships and aircraft as a means of survival and rescue in the event of vessel abandonment.
A specialized boat designed for rescue operations and the evacuation of people in distress at sea. Lifeboats are equipped with safety equipment, survival gear, and propulsion systems to operate in various weather conditions.
A jacket or vest that is filled with buoyant material or incorporates buoyant chambers, worn to keep a
Lifesaving Equipment Inspection
LIFO (Liner In Free Out)
Light List
Lightship Weight
person afloat in water. Also called personal flotation device (PFD).
An inspection conducted by the U.S. Coast Guard to ensure the proper functioning and maintenance of lifesaving appliances, such as lifeboats, life rafts, and personal flotation devices.
The term in a freight contract that defines that the cost of loading the goods onto the vessel is borne by the seller, and the cost of unloading is a buyer’s liability.
A publication that provides information on lighthouses, beacons, and navigational aids, including their characteristics, positions, and operational details.
The weight of a vessel in a completely empty and unladen condition, including the structure, machinery, equipment, fuel, water, and other operational supplies but excluding cargo, passengers, and their effects.
Line The correct nautical term for most ropes used on a boat.
Line of Position (LOP)
A line on a navigational chart or plot that represents the possible position of a vessel at a specific time based on a single celestial observation.
Lines The ropes used on a boat.
LiPO Battery
List
Listing Agreement
Lithium-Ion Battery
LNG
LNG Carrier
Load Line Certificate
A Lithium Polymer (LiPO) battery is a type of lithium-ion battery that uses a solid polymer electrolyte instead of a liquid or gel electrolyte. LiPO batteries are known for their high energy density and lightweight design.
A condition where a boat leans or tilts to one side.
A contract between a vessel owner and a marine broker that authorizes the broker to market and sell the vessel on the owner's behalf.
A rechargeable battery technology that uses lithium ions to store and release energy. Lithium-ion batteries offer a higher energy density, longer lifespan, and lighter weight compared to lead-acid batteries.
Liquefied Natural Gas - A fuel source used in some marine vessels, particularly LNG carriers and dual-fuel engines, known for its lower emissions and cleaner burning characteristics.
A specialized tanker designed for the transportation of liquefied natural gas (LNG) at extremely low temperatures.
A certificate issued to a vessel in accordance with the International Convention on Load Lines, indicating the maximum permissible load draft and the vessel's freeboard based on its construction, stability, and other factors.
Lock A device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways.
Logbook A book in which details of a trip made by a ship or aircraft are recorded.
Loïck Peyron
Long Range Cruiser
Longitude
Longitudinals
French sailor and multihull specialist who has set numerous sailing records, including the fastest circumnavigation of the globe in a trimaran.
A yacht designed for long-distance voyages, offering extended fuel and water capacity, and often includes features such as water makers and large storage areas for provisions.
The distance east or west of the prime meridian measured in degrees. It ranges from 0 degrees at the Prime Meridian to +180 degrees eastward and 180 degrees westward.
Structural members of a yacht running fore and aft (front to back), providing additional rigidity to the structure.
Longshore Current A current that flows parallel to the shoreline, caused by waves striking the coast at an angle.
Longshoreman A person employed in a port to load and unload ships.
Low Pressure System An area where the atmospheric pressure is lower than the surrounding area, often associated with unsettled, stormy weather.
Low Sulphur Fuel Oil (LSFO) A type of fuel used in ship engines. It contains less sulphur than heavy fuel oil, and is used to meet emissions regulations in certain areas.
Low Tide (or Low Water)
LRIT (Long Range Identification and Tracking)
Luff
The state of the tide when it is at its lowest level.
An IMO approved system to globally track and identify ships. It was implemented due to maritime security concerns after the terrorist attacks on 11 September 2001.
The forward edge of a sail. Also the action of a sail fluttering when it is not properly trimmed or a boat steers too far into the wind.
Luffing The flapping or fluttering of a sail when the edge is not properly trimmed in relation to the wind direction.
Lunar Day
The period of time for a specified point on the Earth to complete one rotation with respect to the Moon. Tidal cycles are based on the lunar day, which is 24 hours and 50 minutes.
Luxury Explorer Yacht An elite yacht blending the features of a luxurious superyacht with the capabilities of an explorer yacht for off-the-beaten-path adventures.
Machinery Survey
Magnetic North
Mainsail
Mainsheet
Man Overboard (MOB)
Man Overboard Device (MOB)
Man Overboard Flag
Man Overboard Maneuver
Maneuvering Speed
Marina
Marina Recycling Program
Marina Safety Plan
Marine Accident Investigation Branch (MAIB)
Marine Air Conditioning System
Marine Anchor
Marine Brokerage
Marine Cargo Surveyor
Marine Casualty Investigation
Marine Crane
Marine Depth Sounder
Marine Engineering
Marine Forecast
A survey that examines the mechanical systems and machinery on board a ship, including the propulsion system, power generation, auxiliary machinery, and safety devices.
The direction towards the North Magnetic Pole, to which compasses point.
The principal sail in a sailboat or any sail rigged behind the main mast.
The line used to control the angle and tension of the mainsail.
A situation where a person falls or is thrown into the water from a vessel and requires rescue.
A device which is designed to be carried by individual persons and which communicates user ID, time, and live tracking coordinates via GPS in case they fall into the water.
A flag or buoy used to indicate that a person has fallen overboard and requires immediate attention and rescue.
Any of several methods used to recover a person who has fallen off a boat into the water.
The speed at which a vessel can be safely maneuvered and controlled without compromising its stability or safety.
A facility that provides mooring, storage, and other services for recreational and leisure boats.
A program implemented by a marina to encourage and facilitate recycling of various materials, such as plastic, glass, paper, and aluminum.
A comprehensive plan outlining safety protocols and emergency procedures within a marina, including response to spills, fires, and other incidents to protect both human safety and the environment.
A UK government agency authorized to investigate accidents in the marine industry.
A system that provides cooling and dehumidification of air on board a vessel, ensuring crew and passenger comfort.
A heavy object with protruding flukes or arms that is dropped from a vessel to secure it in place by embedding into the seabed.
The business of facilitating the buying, selling, or chartering of vessels, including commercial ships, yachts, and other watercraft.
A professional who assesses cargo condition, quantity, and packaging for insurance purposes.
An inquiry conducted by the U.S. Coast Guard to determine the cause, circumstances, and contributing factors of a marine accident or incident.
A type of crane designed for use on vessels, used for lifting and moving heavy cargo or equipment on board.
An instrument that measures and displays the depth of water beneath a vessel, aiding in navigation and avoiding shallow areas.
A branch of engineering that deals with the design, construction, operation, and maintenance of the ship's propulsion and on-board systems like mechanical, electrical, electronics and safety systems.
A detailed weather forecast for a marine area, including details about wind, wave, visibility, precipitation,
and other marine-specific conditions.
Marine Gas Oil (MGO) A type of fuel used in ship engines. It is less viscous than fuel oil and has a lower sulphur content.
Marine Grade Aluminium
Marine Guidance Note (MGN) 280
A specific type of aluminium that has been treated to resist corrosion in a marine environment. The most common type used in boat construction is 5083.
A guidance note from the UK Marine and Coastguard Agency. MGN 280 (M) provides guidance on the application of the Merchant Shipping (Accident Reporting and Investigation) Regulations and should be used to decide whether and how to report accidents and incidents. It is applicable to all ships, irrespective of the flag they fly, in UK territorial waters, and to all UK ships wherever they may be.
Marine Hatch An opening in the deck or hull of a vessel that provides access to compartments, cargo holds, or other enclosed spaces.
Marine Insurance Insurance coverage that protects against risks and liabilities associated with maritime activities, including hull damage, cargo loss, and liability for third-party claims.
Marine Liability Insurance Coverage for liabilities arising from maritime operations, such as collisions or pollution.
Marine Piracy
Marine Pollution
Marine Propeller
Marine Pump
The act of attacking ships or vessels in coastal or international waters for the purpose of theft, robbery, or other criminal activities. It involves unauthorized boarding, hijacking, or armed robbery of ships.
The introduction of harmful substances or energy into the marine environment, leading to adverse effects on marine ecosystems and human health.
A rotating device consisting of blades that generate thrust to propel a vessel through the water.
A device used for moving fluids on board a vessel, such as fuel, water, or oil.
Marine Quarantine Measures and procedures implemented to prevent the spread of diseases, pests, and invasive species through ships and other vessels. It involves inspections, health screenings, and control measures for the protection of public health and the marine environment.
Marine Radar An electronic device that uses radio waves to detect and display the presence and location of other vessels, land masses, or objects.
Marine Rescue Coordination Center (MRCC)
A center responsible for coordinating search and rescue operations within a specific maritime region. MRCCs receive distress signals, coordinate response efforts, and manage communication with vessels, aircraft, and other rescue assets.
Marine Sanitation Device (MSD)
Marine Satellite Communication System
Marine Scientific Research
Marine Spatial Planning
Marine Superintendent
Marine Survey and Inspection
A device installed on vessels to treat and manage black water before it is discharged. There are different types of MSDs, such as Type I, II, and III, each with specific treatment capabilities.
Equipment that enables voice, data, and internet connectivity on board a vessel via satellite technology, facilitating communication with shore and other vessels.
The study and investigation of marine ecosystems, resources, and phenomena for scientific purposes, subject to international regulations and cooperation.
The process of organizing and allocating the use of marine space, balancing different activities such as shipping, fishing, energy production, and conservation.
A person who oversees the operations of the vessels of a shipping company. This includes regular inspection of ships, ensuring compliance with various standards and laws, as well as safety and operational efficiency.
41. Condition Survey
Marine Surveyor
Marine Technology Society (MTS)
Marine Terminal Operator (MTO)
Marine Toilet (Head)
Marine Underwriter
Marine Ventilation System
Maritime and Coastguard Agency (MCA)
Maritime Boundary
Maritime Declaration of Health
Maritime Domain Awareness (MDA)
Maritime Labour Convention (MLC)
Maritime Liens
Maritime Safety Committee (MSC)
Maritime Salvage
A professional who conducts inspections, surveys, or examinations of marine vessels to assess, monitor, and report on their condition and the products on them, as well as inspects damage caused to both vessels and cargo.
A non-profit international professional association founded in 1963 that aims to disseminate knowledge of the science and practice of marine technology.
An organization or company that operates and manages the facilities and operations within a port terminal.
A toilet specifically designed for use on board a vessel, often equipped with features to handle the marine environment.
An insurance professional who assesses risks and determines policy terms for marine insurance.
A system of fans, ducts, and vents designed to supply fresh air and remove stale air from enclosed spaces on board a vessel.
The UK's governmental body responsible for the coordination of maritime safety policy, implementing British and international maritime law and safety policy.
A demarcation line or zone that separates the territorial waters and exclusive economic zones of neighboring coastal states.
A document required by port authorities, providing information on the health condition of the vessel and crew, particularly during public health emergencies.
The comprehensive understanding of activities, threats, and risks within a maritime domain. It involves the collection, analysis, and dissemination of information to support decision-making and security operations.
An international labor standard that sets out minimum requirements for the working and living conditions of seafarers on board ships.
Legal claims or rights that provide security for debts or obligations arising from maritime transactions, such as unpaid freight charges or ship mortgages.
A committee within the International Maritime Organization (IMO) responsible for developing and maintaining international regulations and guidelines on maritime safety.
The legal process by which a salvor assists in rescuing or recovering a ship, its cargo, or property in maritime distress, in exchange for a salvage award.
Maritime Security Measures and procedures aimed at ensuring the safety and security of vessels, ports, and maritime infrastructure against security threats, piracy, and terrorism.
Maritime Security Assessment
Maritime Security Officer
Maritime Terrorism
An evaluation of potential security risks and vulnerabilities in the maritime domain, including the identification of potential terrorist threats. It helps to develop security strategies and countermeasures.
A trained professional responsible for ensuring the security and safety of ships, ports, or maritime facilities. They may conduct security assessments, implement security measures, and coordinate responses to security incidents.
The use of violence, intimidation, or coercion to instill fear or advance political or ideological goals within the maritime domain. It can involve attacks on ships, ports, offshore installations, or maritime trade routes.
Mark A buoy or other fixed object used as a turning point or reference point along the racecourse.
Market Analysis
An evaluation of current market conditions, supply and demand dynamics, and recent sales data to determine an appropriate listing price or offer for a vessel.
Marlinspike
MARPOL (International Convention for the Prevention of Pollution from Ships)
MARPOL Annex VI
A tool used in marine ropework for tasks such as unlaying rope for splicing, untying knots, or forming a makeshift handle.
An international marine environmental convention designed to minimize pollution of the seas, including dumping, oil, and exhaust pollution.
The section of the International Convention for the Prevention of Pollution from Ships (MARPOL) that sets limits on sulphur oxide and nitrogen oxide emissions from ship exhausts and prohibits deliberate emissions of ozone-depleting substances.
MARPOL Certificate A certificate indicating that a vessel has been designed and operated in accordance with the standards set out in the International Convention for the Prevention of Pollution from Ships.
Mask A device that covers the eyes and nose, creating an airspace for clear vision and allowing the diver to equalize the pressure in the ears.
Mast The vertical pole on a ship that supports sails or rigging.
Master Mariner
Masthead
A licensed mariner who holds the highest grade of seafarer qualification, competent to serve as the captain of any ship, of any size, of any type, operating anywhere in the world.
The topmost part of the mast where various lines and rigging are attached.
Maud Fontenoy French sailor and environmental activist known for her solo crossings of the Atlantic and Pacific Oceans, raising awareness about ocean conservation.
Mayday
Mayflower
MCA (Maritime and Coastguard Agency)
Mean High Water (MHW)
Mean Low Water (MLW)
Medical Evacuation (MEDEVAC)
Mega Yacht
Megayacht
Melges 24
Mercator Projection
Merchant Navy Training Board (MNTB)
The international distress signal used to indicate a life-threatening emergency at sea.
English ship that transported the Pilgrims to the New World in 1620, establishing the Plymouth Colony in present-day Massachusetts, USA.
A UK executive agency responsible for the regulation and enforcement of maritime safety policy, ship safety inspections and maritime radio communications.
The average height of the high waters over a 19-year period.
The average height of the low waters over a 19-year period.
The transport of injured or ill individuals from a vessel to a medical facility for urgent medical care.
A larger superyacht, often exceeding 100 meters (328 feet) in length.
A large, luxurious motor yacht typically measuring over 80 feet in length, offering exceptional onboard amenities and lavish accommodations.
A one-design keelboat class known for its fast and competitive racing. The Melges 24 is popular worldwide and has a strong international racing circuit.
A type of map projection where the meridians and parallels appear as lines crossing at right angles and areas appear greater the farther they are from the equator.
A UK maritime shipping industry body that provides guidelines, advice, and support for training requirements and career promotion in the maritime industry.
Meridian Passage The instant when a celestial body reaches its highest point (culmination) in the observer's sky. It is used to determine the Greenwich Hour Angle (GHA) of the celestial body for navigation calculations.
Meteorological Tide A tide that is affected by meteorological changes, such as atmospheric pressure and wind.
Meteorology
MF/HF (Medium Frequency/High Frequency)
Radio
The scientific study of the atmosphere that focuses on weather processes and forecasting.
Frequency bands used for marine communications and emergency distress and safety transmissions.
Microburst A sudden, powerful, localized air current, especially a downdraft.
Midnight Sun
Midships
Mike Horn
Mixed Tide
Mizzen
MMSI (Maritime Mobile Service Identity)
Monkey's Fist
Monsoon
Mooring
Mooring Line
Mother Ship
Motor Yacht
Multi-Hull
Multiple Listing
Mushroom Anchor
Muster Point
A natural phenomenon occurring in summer months at places north of the Arctic Circle and south of the Antarctic Circle where the sun remains visible at the local midnight.
The central part of a ship.
South African-born Swiss adventurer and sailor who has completed multiple solo circumnavigations and extreme expeditions, including crossing the Arctic Circle.
A tide that exhibits characteristics of both semidiurnal and diurnal tides, usually with two uneven tides each day.
The third mast, or the mast aft of a mainmast on a ship having three or more masts. Most commonly found on ketches and yawls.
A series of nine digits which are sent in digital form over a radio frequency channel in order to uniquely identify ship stations, ship earth stations, coast stations, coast earth stations, and group calls.
A decorative knot often used as a weight or heaving line at the end of a rope.
A seasonal reversing wind accompanied by corresponding changes in precipitation.
The process of securing a vessel to a fixed point, such as a dock, buoy, or another vessel, using ropes or lines.
A rope used to secure a vessel to a dock or other fixed structure, providing stability and preventing drift.
A larger vessel used by pirates to transport skiffs, equipment, and crew for extended operations at sea.
A yacht propelled by one or more internal combustion engines or electric motors.
A hull form consisting of two or more parallel hulls, such as catamarans or trimarans, providing stability, increased interior volume, and reduced drag.
A listing agreement where a vessel is listed with multiple brokers, allowing for wider exposure and increased chances of finding a buyer.
An anchor with a large, rounded head resembling a mushroom, offering excellent holding power in soft, muddy seabeds.
Designated locations on board a vessel where crew and passengers gather during emergencies for roll call and further instructions.
National Flag
Nautical Almanac
Also known as the ensign, it represents the nationality or country of a vessel. Each country has its own unique national flag.
A publication that provides essential astronomical data, such as the positions of celestial bodies at specific times, to aid in celestial navigation calculations.
Nautical Chart A map designed for safe navigation at sea, produced by the British Admiralty and other hydrographic offices, providing information on depths, aids to navigation, and hazards.
Nautical Institute (NI)
Nautical Mile
Naval Vessel
Navigation
Navigation and Communication Equipment Inspection
Navigation Channel
Navigation Lights
Navigation Officer
Navigational Chart Plotter
Navigational Inspection
Navigational Safety Information
Navigational Warning
Navtex
Neap Tides
Negotiation
Net Tonnage
Net Tonnage (NT)
An international representative body for maritime professionals involved in the control of sea-going ships. They provide certification for DPOs.
A unit of measurement used in air and marine navigation, and for the definition of territorial waters. It is equal to one minute of a degree of latitude and is approximately 1.15 statute miles or 1.852 kilometers.
A ship used by a navy or military force for defense, surveillance, combat, or other naval operations.
The art and science of conducting a boat safely from one point to another.
An inspection conducted by the U.S. Coast Guard to verify the proper functioning of navigational aids, communication systems, and navigation lights on board vessels.
The designated pathway within a waterway or harbor that is dredged and maintained to provide safe passage for vessels.
Colored lights used on a boat at night to indicate the size of the boat, the angle where others will see it, the direction it is going, and if it is underway or at anchor.
A licensed member of the deck department of a merchant ship who is responsible for the navigation of the vessel, cargo handling, and ship communications.
Electronic equipment used to display and track a vessel's position, course, and other navigational information using electronic charts.
An examination of a ship's navigational equipment and systems for compliance with safety regulations.
Official publications and bulletins that provide mariners with up-to-date information on navigational safety, including new or changing conditions.
A notice issued to mariners by the British Admiralty or hydrographic offices, alerting them to temporary hazards or changes affecting navigation.
A navigational telex, an international automated medium frequency service for delivery of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information to ships.
A tide just after the first or third quarters of the moon when there is least difference between high and low water.
The process of reaching an agreement on price, terms, and conditions between the buyer and seller, facilitated by the marine broker.
The volume of cargo a vessel can carry; it is gross tonnage minus the volume of spaces that will not hold cargo.
A dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula. It is used in shipping agreements (such as the Hague-Visby Rules) to calculate
Newport to Bermuda Race
Night Vision
Nitrox
No-Go Area
NOAA (National Oceanic and Atmospheric Administration)
Non-Destructive Testing (NDT)
Northern Sea Route
Northwest Passage
Notice to Mariners
Nowcast
Nylon
limitation of liability.
A classic offshore race from Newport, USA, to Bermuda, covering a distance of approximately 635 nautical miles, attracting a diverse fleet of yachts.
Many marine FLIR cameras incorporate night vision capabilities, allowing users to see and navigate in lowlight or nighttime conditions. By detecting thermal signatures rather than relying on visible light, these cameras can provide enhanced situational awareness and safety during nighttime operations at sea.
A breathing gas mixture with a higher oxygen content than regular air, typically used to extend bottom time or reduce nitrogen absorption during repetitive dives.
An area marked on a chart that is unsafe for a ship to enter due to hazards such as shallow water, rocks, or dangerous wrecks.
An American scientific agency that focuses on the conditions of the oceans, major waterways, and the atmosphere.
Techniques used during surveys to assess the condition of ship structures, components, and welds without causing damage. This includes methods such as ultrasonic testing, magnetic particle inspection, visual inspection, and radiographic testing.
A shipping route that passes through the Arctic Ocean, connecting the Atlantic and Pacific Oceans along the Russian coastline.
A historically significant shipping route through the Arctic Archipelago of Canada, connecting the Atlantic and Pacific Oceans.
A regular publication by hydrographic offices worldwide which informs mariners of important matters affecting navigational safety.
A short-term weather forecast, generally out to six hours.
A synthetic fiber known for its high strength, elasticity, and resistance to abrasion, commonly used in marine ropes.
Oar
Occluded Front
Oceanic Gyre
Octopus
Off-Hire
Off-Hire Survey
Officer of the Watch (OOW)
Offshore Classification
Offshore Supply Vessel (OSV)
Oil Record Book (ORB)
Oil Spill Containment Boom
Olympic Sailing
On-board Blending
On-Hire Survey
Outboard Engine
Outfitting
A tool used for propulsion of a boat by a rower.
A composite of two fronts, formed as a cold front overtakes a warm front.
Large, circular systems of ocean currents formed by the rotation of the Earth and wind patterns, such as the North Atlantic Gyre or the Pacific Gyre.
An additional second-stage regulator attached to a longer hose that is used as an alternate air source in case of an emergency.
The period during which the vessel is not available or suitable for the charterer's use, typically due to repairs or maintenance, resulting in suspension of charter payment obligations.
An inspection of a chartered ship at the end of a charter period to assess its condition and compliance.
A watchstanding officer on a merchant vessel. Depending on the ship and company, they may be responsible for supervising the ship's crew, ensuring the ship's safety and security, and managing operations.
Classification of offshore structures, such as oil rigs and platforms, to ensure safety and compliance.
A ship that provides various support services to offshore oil and gas platforms, such as transportation of personnel, supplies, and equipment.
A logbook where the ship's crew records all oil-related operations and discharges to ensure compliance with international pollution prevention regulations.
A floating barrier used to contain and control oil spills in water. It helps to prevent the spread of oil and facilitates its recovery during cleanup operations.
Sailing events included in the Olympic Games, where sailors compete in various classes and disciplines such as dinghy racing, keelboat racing, and windsurfing. The Olympic sailing competition features both men's and women's events.
The mixing of two different types of bunker fuel onboard a vessel to achieve a desired viscosity or sulphur content.
An inspection of a chartered ship to assess its condition and compliance before entering a charter agreement.
A self-contained propulsion system consisting of an engine, gearbox, and propeller, mounted externally on the transom of a vessel.
The process of installing equipment, furnishings, and systems (like plumbing and electrical) on a boat after the hull has been constructed.
Outhaul A line used to control the shape of a sail by pulling the clew outwards along the boom.
Outlook An extended-range forecast that provides
Overtaking
The act of approaching another vessel from a direction more than 22.5 degrees abaft its beam, where a risk of collision may exist. (COLREGS)
Owner's Protective Clauses Clauses in the charter party that protect the shipowner's interests, such as provisions for indemnity, cancellation, or withdrawal of the vessel.
Ozone-Depleting
Chemical compounds which react with and deplete stratospheric ozone, leading to the widely publicized
Substances (ODS) 'ozone holes'. The emission of ODS from ships is controlled by Annex VI of MARPOL.
Pack Ice
Packing List
Paint System
Painter
Painter's Hitch
Painting and Coating
Palletization
Pan-Pan
Pancake Ice
Passagemaker
Patrol Boat
Pelorus
An area of closely packed ice floes that make navigation difficult or impossible for most vessels.
A document that provides detailed information about the contents, quantities, and packaging of a shipment, assisting in customs clearance and cargo identification.
The specific combination of primer, undercoats, and topcoats used to paint a yacht.
A rope that is attached to the bow of a dinghy, or other small boat, and used for tying up or towing.
A knot used for securing a painter (rope) to a boat.
The application of protective paints and coatings to the ship's surfaces, providing corrosion resistance and aesthetic appearance.
The process of securing cargo onto pallets for easier handling, storage, and transportation.
The international urgency call used in voice communications to indicate a situation that is urgent but not immediately life-threatening. It is used to request assistance for non-life-threatening situations.
Circular pieces of ice that have been worn down on the sides by collision with one another. They have diameters ranging from 30 centimeters to 3 meters.
A vessel designed and equipped for extended, self-sufficient cruising over long distances and often across oceans.
A small naval vessel used for patrolling and enforcing maritime laws, often in coastal or littoral waters.
A reference tool for maintaining bearings of a vessel at sea. It does not determine the cardinal points but only the relative bearings.
Penalty A prescribed action or time penalty imposed on a yacht for a rules violation, often resulting in a loss of time or a requirement to perform a penalty turn.
Perigean Spring Tide
A tide that occurs three or four times a year when a new or full moon coincides with the closest distance that the Moon reaches to Earth in its elliptic orbit.
Perils of the Sea Hazards encountered in the marine environment, such as storms, waves, or collisions.
Periodical Survey
Permafrost
Personal Flotation Device (PFD)
Personal Locator Beacon (PLB)
Regular inspections and checks carried out by a classification society to ensure a ship's continued compliance with class rules.
Ground, including rock or soil, at or below the freezing point of water for two or more years. It is common in high latitudes.
Any device that provides buoyancy to help someone stay afloat.
A small distress beacon that can be carried by individuals. When activated, PLBs transmit a distress signal to satellite systems, aiding in the location and rescue of the person in distress.
Peter Blake New Zealand yachtsman and multiple world champion who led Team New Zealand to victory in the America's Cup in 1995 and 2000.
Pier A loading platform extending at an angle from the shore.
Piling A support, a column or pillar used to reinforce the dock's structure.
Pilot
A trained and certified mariner who provides navigational assistance and expertise to ships entering or
Pilot Boat
Pilot House (or Wheelhouse)
Pilot Station
Pilotage
Pilotage
Pilothouse
Piloting
leaving ports or navigating through challenging waterways. Pilots are familiar with local conditions, hazards, and regulations.
A specialized vessel used for transporting pilots to and from ships. Pilot boats are designed for speed, maneuverability, and safe transfer of pilots between the boat and the ship.
The location on a ship where navigational equipment is present and where the person in charge of navigation, the pilot, has unobstructed views.
A designated location, typically near the entrance of a port or waterway, where pilots embark or disembark from vessels. Pilot stations serve as the base of operations for pilotage services.
The process of guiding ships through challenging or unfamiliar waters, ports, or channels, usually performed by a qualified pilot. Pilotage ensures the safe navigation of vessels in congested or restricted areas.
The service provided by a trained pilot who assists in navigating a vessel safely through a port or other challenging waters.
A space on a boat where the navigation and steering equipment is located. On an explorer or trawler yacht, this is often enclosed and insulated for comfort in all weather conditions.
Navigating a vessel in coastal or river areas, usually implying frequent or continuous determination of position relative to nearby points.
Ping In SONAR, a ping refers to the sound signal or pulse of sound emitted by the SONAR system. The SONAR device sends out these sound waves into the water, which then bounce off objects and return to the system, providing information about the underwater environment.
Piracy
Piracy Hotspots
Pirate
Pirate Attack
Pirate Skiff
Pitch
Pitching
Pivot Point
Planing Hull
Plating
Plotting
Pod Drive
Acts of robbery, violence, or criminal activities committed at sea, typically involving the boarding and hijacking of ships for ransom or theft.
Regions or specific areas of the world where piracy incidents are particularly prevalent or frequent. These areas may require heightened security measures and increased vigilance by ships and crews.
An individual or group engaged in acts of piracy, typically targeting ships at sea to steal cargo, valuables, or ransom crew members.
A coordinated assault on a ship or vessel by pirates, involving attempts to gain control of the vessel, take hostages, or loot the cargo.
A small, fast boat typically used by pirates for approaching and boarding larger ships.
The theoretical forward movement of a marine propeller in one complete revolution, typically measured in inches or degrees.
The up and down movement of a vessel's bow and stern.
The point around which a vessel rotates or turns when maneuvering, typically located amidships.
A hull form designed to rise and ride on top of the water surface at higher speeds, typically featuring a flatter bottom and reduced wetted surface area for reduced drag and increased speed.
The exterior skin of a boat. In an aluminium motor yacht, this would be aluminium sheet.
The act of marking a course on a navigational chart.
A propulsion system where the engine and propeller are housed in a pod or casing that can be rotated for enhanced maneuverability and efficiency.
POD Drive
Polar Circles
Polar Code
Polar Code Certification
Polar Night
Polars (Navigational)
Pollution Control
Pollution Liability
Pollution Prevention
Pollution Prevention Inspection
Pollution Response Vessel
Polyester
Polynya
Polypropylene
Pod propulsion is a type of propulsion system where the propulsion units, including the engines and propellers, are housed in pods located outside the hull, allowing for better maneuverability and efficiency.
The two imaginary lines of latitude at about 66.5 degrees North (Arctic Circle) and South (Antarctic Circle) of the Equator. Inside these lines, the sun does not set on the summer solstice and does not rise on the winter solstice.
International regulations and guidelines for ships operating in polar waters, addressing safety, environmental, and operational requirements.
Certification by a classification society to ensure ships comply with the International Code for Ships Operating in Polar Waters.
A period during winter when the sun does not rise above the horizon, occurring only inside the polar circles.
Graphs or diagrams that depict a vessel's expected speed under different wind conditions, allowing sailors to plan optimal routes based on wind angles.
Measures and procedures implemented to prevent or mitigate environmental pollution resulting from accidents or salvage operations.
The legal responsibility of shipowners, operators, and charterers for pollution-related damage caused by their vessels, including oil spills or hazardous substance releases.
Measures and practices implemented to prevent or minimize pollution from entering the marine environment, including proper waste management, spill response plans, and environmental education.
An inspection conducted by the U.S. Coast Guard to assess a vessel's compliance with environmental regulations, including waste management, ballast water treatment, and pollution prevention measures.
A specialized vessel equipped with equipment and resources for responding to marine pollution incidents.
A synthetic fiber with high strength, low stretch, and good resistance to UV degradation, commonly used in marine ropes.
An area of open water surrounded by sea ice. They are crucial habitats for marine mammals and are associated with upwelling currents that bring nutrient-rich water to the surface, causing phytoplankton blooms.
A synthetic fiber commonly used in marine ropes due to its lightweight, buoyancy, and resistance to UV degradation.
Port The left side of the boat when facing the bow.
Port Authority
Port Control
Port Efficiency
Port Equipment
Port Facility
A governmental or administrative body responsible for managing and operating a port, including maintaining infrastructure, safety, and security.
The authority responsible for the control, coordination, and regulation of vessel movements within a port. Port control monitors ship traffic, provides navigation assistance, and ensures compliance with port regulations.
The measure of how effectively and efficiently a port operates, including factors such as turnaround time, productivity, and utilization of resources.
The machinery and equipment used for cargo handling and port operations, including cranes, forklifts, and conveyor systems.
An area within a port used for loading, unloading, storage, and other activities related to cargo handling.
Port Health Authority
Port Immigration
Port Logistics
Port of Alexandria
Port of Buenos Aires
Port of Cape Town
Port of Dubai
Port of Entry
Port of Hamburg
Port of Istanbul
Port of Liverpool
Port of London
Port of Marseille
Port of Mumbai
Port of New York and New Jersey
Port of Rio de Janeiro
Port of Rotterdam
Port of San Francisco
Port of Shanghai
Port of Singapore
The local authority responsible for monitoring and regulating public health measures related to ships, ports, and marine activities. They may oversee quarantine procedures, health inspections, and disease control measures.
The process of controlling the entry and exit of people into and out of a port or country. It involves immigration checks, documentation verification, and clearance procedures.
The management and coordination of various activities, including cargo handling, storage, transportation, and documentation within the port.
An important port in Egypt, historically renowned for its strategic location and connection to the Mediterranean Sea.
The principal port of Argentina, serving as a key hub for trade, cultural exchange, and showcasing the city's vibrant waterfront.
A prominent port in South Africa, serving as a gateway to the continent and offering stunning views of Table Mountain.
A key port in the Middle East, serving as a major transshipment hub and an important center for trade and commerce in the region.
A designated port where vessels can enter a country for immigration, customs, and clearance purposes.
One of Europe's largest and busiest ports, located in Germany, historically important for its role in global trade and maritime connections.
A strategically important port connecting Europe and Asia, known for its historical significance and the stunning Bosphorus Strait.
A historic port in the UK, renowned for its maritime heritage, industrial significance, and as a major hub of transatlantic trade.
A historic port on the River Thames, playing a vital role in the UK's maritime trade, shipping, and cultural heritage.
A historic port in France, known for its cultural significance, trade connections, and as the gateway to the Mediterranean.
A major port in India, serving as the country's gateway for trade and commerce and playing a significant role in its economic development.
The largest port complex on the East Coast of the United States, serving as a crucial gateway for international trade.
A bustling port in Brazil, known for its stunning natural harbor, vibrant culture, and hosting major events like the Olympics.
Europe's largest port, located in the Netherlands, serving as a key gateway for goods entering and leaving the continent.
An iconic port on the West Coast of the United States, historically significant during the California Gold Rush and now a major center for technology and innovation.
The world's largest port by cargo tonnage, situated in China, serving as a major economic and trading center in East Asia.
One of the busiest and most important ports in the world, serving as a vital global shipping and logistics hub in Southeast Asia.
Port of Sydney
Port of Vancouver
Port Operations Center
Port Security
Port State Control (PSC)
Port State Control Officer
Port State Jurisdiction
Port Terminal
Porthole
Portolan Chart
Position Dilution of Precision (PDOP)
Position Fix
Position Mooring (PM)
Positioning System Interface Control Document (ICD)
Potable Water
Power-driven Vessel
Pre-Arrival Notification
A significant port in Australia, known for its iconic landmarks like the Sydney Opera House and serving as a major entry point to the country.
A significant port in Canada, offering access to the Pacific Ocean and serving as a crucial trade link between North America and Asia.
A central facility where port activities and operations are coordinated, including vessel movements, cargo handling, and communication.
Measures and protocols implemented to ensure the safety and security of the port, its facilities, and the cargo being handled.
The inspection regime conducted by port authorities to ensure that visiting foreign-flagged vessels comply with international standards and regulations.
An authorized official representing the port state who conducts inspections on visiting foreign-flagged ships to ensure compliance with international standards.
The authority of a coastal state to regulate and enforce laws and regulations over foreign-flagged vessels while they are within its territorial waters or ports.
A facility where cargo is loaded, unloaded, and transferred between different modes of transportation, such as ships, trucks, and trains.
An opening in a ship's side providing light and ventilation.
A navigational map based on compass directions and estimated distances observed by the pilots at sea. They were first made in the 13th century in Italy, Portugal and Spain.
A measure of the quality or accuracy of a GPS position fix. It indicates the geometric strength of the satellite constellation in relation to the receiver's location.
The determination of a vessel's position using GPS or satellite navigation systems by receiving signals from multiple satellites and calculating the intersection of the satellite orbits.
A system using traditional mooring lines, but with the addition of active control that can be used to automatically position a vessel.
A technical document that defines the format and content of the GPS signals and messages transmitted by the satellites. It is used by GPS receiver manufacturers to design compatible receivers.
Drinkable water that is safe to be consumed or used with low risk of immediate or long-term harm.
Any vessel propelled by machinery, such as engines. (COLREGS)
The requirement for ships to provide advance notice to customs and port authorities of their impending arrival, including information about the ship, its crew, passengers, and cargo. This helps facilitate customs clearance and port operations.
Pre-Purchase Survey
Pressure Ridge
Pressure System
Preventer
Private Maritime Security
An inspection of a ship conducted before purchase to evaluate its condition, value, and suitability.
A ridge in the ice cover formed by wind or currents stressing the ice.
A large area of high or low atmospheric pressure, often associated with particular weather patterns.
A line used to prevent or restrict movement, such as to stop the boom from accidentally jibing.
A private security firm specializing in providing armed guards or security personnel to protect ships from
Company (PMSC) pirate attacks. These companies adhere to international regulations and guidelines governing the use of force.
Prohibited and Restricted Goods
Propeller
Goods that are not allowed to be imported or exported due to legal or regulatory restrictions, such as certain weapons, drugs, endangered species, or hazardous materials. These goods require special permits or licenses for clearance, or they may be entirely banned from crossing borders.
A type of fan that transmits power by converting rotational motion into thrust for propulsion of a vehicle such as an aircraft, ship, or submarine through a fluid such as air or water.
Propeller (or Prop) A type of fan that transmits power by converting rotational motion into thrust for propulsion of a vessel through water.
Propeller Diameter Ratio
Propeller Pitch Ratio
Propeller Shaft
Protection and Indemnity (P&I) Insurance
The ratio between the propeller's diameter and the vessel's hull beam, influencing propeller efficiency and performance.
The ratio between the distance traveled in one revolution and the propeller's theoretical pitch, indicating the efficiency and load-carrying capability.
The shaft that transmits rotational power from the engine to the marine propeller, often connected through a gearbox or stern drive.
Provides liability coverage for shipowners and operators.
Protest A formal complaint by one yacht against another for an alleged violation of the racing rules.
Protest Flag
Provisioning List
Provisions
Prusik Knot
Pseudorange
Pulley
Pulse Compression Radar
Pump-out Station
A flag flown by a vessel to indicate that it intends to protest another vessel for an alleged rules violation during a race.
A list of food, drink, and other goods that need to be brought on board a ship before it embarks on a journey.
Necessary supplies such as food and beverages that are stored for use during the voyage.
A knot used in climbing or rigging to create a friction hitch, allowing one rope to grip another securely.
The measured distance between a GPS receiver and a satellite, as calculated from the time it takes for the GPS signal to travel from the satellite to the receiver.
A wheel with a grooved rim around which a cord passes, which acts to change the direction of a force applied to the cord and is used in the running rigging of a sailing ship.
A radar technology that increases resolution and range by modulating the radar pulse.
A facility within a marina or harbor where boats can empty their black water holding tanks for proper disposal or treatment.
Purser An officer on a ship who handles financial accounts and various administrative duties, often also in charge of the ship's supplies.
Pyrotechnics
Firework devices used for distress signaling on ships.
Q Flag
Quality Assurance Manager (Maritime)
Quartermaster
Quay
Queen Elizabeth 2
Queen Mary 2
A yellow flag with a black letter "Q" used to signal that a vessel is under quarantine and requires clearance from health or customs authorities.
A person responsible for managing and overseeing the quality of maritime operations and procedures to ensure standards are met and safety is maintained.
The officer who is responsible for steering the ship and manning the wheel.
A structure or platform along the waterfront where vessels can be moored for loading and unloading operations.
Iconic British ocean liner known for its elegance and transatlantic crossings, serving as a symbol of luxury and maritime travel.
Iconic ocean liner, the largest passenger ship in the world when launched in 2003, known for its luxury and transatlantic crossings.
Race Committee The organizing authority responsible for managing and overseeing the race, including setting the course and enforcing the rules.
Race Committee Flag A flag used by race organizers or race committees to signal different instructions or conditions during a sailing race.
Racing Flag A flag used to mark the start, finish, or various marks or turning points during a sailing race.
Radar An object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
Radar Beacon (RACON) A type of radar transponder placed on fixed or floating hazards to shipping to amplify their image on a radar display.
Radar Dome (Radome) A structural, weatherproof enclosure that protects a radar antenna. The radome allows for the free transmission and reception of radar signals.
Radar Echo The reflection of a radar signal off an object.
Radar Navigation The use of radar systems for navigation, including the detection of other vessels, land features, and obstacles.
Radar Plotting
Radar Range
The process of tracking the position and movement of radar contacts to prevent a collision.
The maximum distance at which a radar system can detect objects.
Radar Reflector A special device designed to make a vessel more visible on radar screens.
Range The distance a vessel can travel at a certain speed before needing to refuel.
Ransom Payment Money or goods paid to pirates or kidnappers as a demand for the safe release of hostages or captured vessels.
Rating A measurement or handicap system used to determine the relative performance of different yachts, allowing for fair competition.
Reacher A large, lightweight headsail used for downwind sailing when the wind is abaft the beam.
Real-Time Kinematic (RTK) A high-precision positioning technique that provides real-time, centimeter-level accuracy by using a fixed base station and a mobile rover receiver.
Receiver A device that receives signals from GPS satellites and calculates the user's position based on the received data.
Recreational Vessel A vessel intended for private, non-commercial use, typically used for recreational activities such as pleasure boating, yachting, or water sports.
Reef To reduce the area of a sail, usually to reduce the power it generates in strong winds.
Reefer Short for refrigerated container, it is used for the transportation of temperature sensitive cargo.
Reefer Container
Reefer Ship
Reference Systems
A refrigerated container used to transport perishable goods, maintaining specific temperature conditions during transit.
A vessel equipped with refrigeration systems for transporting perishable goods, such as fruits, vegetables, or meat, at controlled temperatures.
Systems providing data input to the dynamic positioning system on the vessel's position and motion. This could include GPS, Gyrocompass, Motion Reference Unit (MRU), Hydroacoustic Position Reference (HPR), Taut Wire, Radar sensors, etc.
Refrigerated Storage
Regatta
Registered Length
Regulator
Remedial Survey
Replenishment At Sea (RAS)
Rescue Boat
A place where perishable goods are stored at low temperature to prevent spoilage.
A series of races or a competitive event involving multiple yachts or sailing vessels.
The length of a vessel as officially registered or documented, usually measured from the forward tip of the bow to the aft tip of the stern, excluding bowsprits, pulpits, swim platforms, and other extensions.
A device that reduces the high-pressure air from the scuba tank to a breathable pressure and delivers it to the diver through a mouthpiece.
A survey conducted following a deficiency or incident to assess and verify that necessary repairs or corrective actions have been carried out to restore the vessel's compliance and safety.
The process of transferring fuel, munitions, and stores from one ship to another while at sea.
A specialized boat or vessel used for rescue operations, equipped with essential safety and navigation equipment.
Rescue Helicopter A helicopter equipped for search and rescue operations at sea. Rescue helicopters are used to locate, rescue, and transport people in distress, often working in conjunction with other rescue assets.
Rescue Swimmer Hoist
Research Vessel
Resetting
Restricted Visibility
Rhumb Line
Rib
RIB (Rigid Inflatable Boat)
Rigging
Rip Current
Risk Assessment
Ro-Ro (Roll-on/Roll-off) Ship
Roach
Roald Amundsen (18721928)
Rode
A mechanism or device used to lift a rescue swimmer or survivor from the water into a helicopter during a rescue operation. Hoists ensure the safe and efficient retrieval of individuals in distress.
A ship equipped with scientific instruments and facilities for conducting research and exploration in marine environments.
The action of an anchor re-engaging the seabed after being temporarily dislodged or dragged due to changes in wind or current.
Any condition in which visibility is restricted by fog, mist, heavy rain, snow, or any other similar phenomenon. (COLREGS)
A line following a constant bearing, and thus crossing all meridians at the same angle.
A thin strip of material, usually aluminium, attached to the inside of the hull to provide additional structural support.
A lightweight but high-performance and high-capacity unsinkable boat constructed with a rigid hull base and inflated tubes.
The system of ropes or chains employed to support a ship's masts and to control or set the yards and sails.
A powerful,
The evaluation and analysis of potential risks and hazards associated with the movement of people, goods, and vessels across borders. Customs and port authorities conduct risk assessments to identify high-risk shipments, passengers, or activities that require further scrutiny or inspection.
A vessel designed for the transport of wheeled cargo, such as cars, trucks, trailers, or railroad cars, that can be driven on and off the ship.
The part of a sail, which extends beyond a straight line between two points on a sail, such as the head and the clew, or the luff and leech.
Norwegian explorer who led the first successful expedition to reach the South Pole and was the first person to traverse the Northwest Passage.
The anchor line, chain, or cable connecting the anchor to the vessel.
Rogue Wave
Rolex Middle Sea Race
Roll
Rolling Hitch
Rope's End
Rotten Ice
Round the Island Race
Round Turn and Two Half Hitches
Round-Bilge Hull
Route du Rhum
Royal New Zealand Yacht Squadron (RNZYS)
Royal Ocean Racing Club (RORC)
Royal Sydney Yacht Squadron (RSYS)
Royal Yachting Association (RYA)
Rudder
Running Rigging
A large, unexpected, and suddenly appearing surface wave that can be extremely dangerous, even to large ships and ocean liners.
A Mediterranean offshore race that starts and finishes in Malta, covering a challenging course of approximately 606 nautical miles, showcasing stunning scenery and varied weather conditions.
The rocking side-to-side motion of a vessel.
A knot used to secure a line to a larger diameter object, such as a spar or pole, under tension.
The end of a rope or line.
Old sea ice that has become honeycombed and is in an advanced state of disintegration.
An annual yacht race around the Isle of Wight in the UK, attracting a large fleet of boats of all sizes. It is one of the largest participation events in sailing and offers a unique and challenging course.
A knot used to secure a line to a post or ring, providing a reliable and adjustable hitch.
A hull form with smoothly curved sections, providing a balance of stability and performance in various sea conditions.
A transatlantic single-handed yacht race held every four years, starting in Saint-Malo, France, and finishing in Pointe-à-Pitre, Guadeloupe. The race attracts sailors from various classes, including multihulls and monohulls.
A prominent yacht club based in Auckland, New Zealand, known for its involvement in the America's Cup. The RNZYS has a rich history and has produced many successful sailors.
A prestigious yacht club based in the UK, renowned for organizing offshore races such as the Fastnet Race and the Rolex Middle Sea Race. It promotes and supports offshore racing worldwide.
A prestigious yacht club in Sydney, Australia, known for its active racing program and support for sailors at all levels.
The national governing body for sailing in the United Kingdom. The RYA provides training, certifications, and support for sailors of all levels, from recreational boaters to competitive racers.
A movable surface located at the stern of a vessel, used to steer and control the direction of the ship.
The rigging of a sailing vessel that is used for raising, lowering, shaping and controlling the sails. This is different from the standing rigging, which supports the mast and other spars.
S Band Radar
S-VDR (Simplified Voyage Data Recorder)
Safe Haven
Safety Equipment Certificate
Safety Management System (SMS) Audit
Safety Officer
Safety Stop
Sail
Sail Bag
Sail Battens
Sail Canada
Sail Cover
Sail Foot
Sail Loft
Sail Repair Kit
Sail Slab
Sail Slide
Sail Stopper
Sail Tie
Sail Track Stop
Sail Training International
Operates in the frequency range between 8 and 15 GHz, providing longer range coverage and better performance in adverse weather conditions, but with slightly lower resolution compared to K band radar.
A simpler version of a VDR, designed to meet lower cost and smaller physical size requirements of smaller vessels.
Coastal areas or islands where pirates seek refuge and hide after carrying out attacks or hijackings.
A document issued after inspection to confirm that a ship's safety equipment meets the required standards and is in proper working condition.
An assessment of a ship's safety management system to ensure compliance with international regulations.
An officer appointed by the shipowner company to ensure that there are safety practices in place onboard the vessel and that the crew follows them.
A period of time spent at a shallow depth (usually 3-5 minutes) before surfacing to allow the body to offgas nitrogen and reduce the risk of decompression sickness.
A piece of fabric attached to a boat and arranged such that it causes the wind to drive the boat along. The sail may be attached to the boat via a combination of mast, booms, and halyards.
A bag used to store and protect a sail when it's not in use.
Stiffeners inserted into pockets along the trailing edge of a sail to maintain its shape and improve performance.
The national governing body for the sport of sailing in Canada. Sail Canada promotes and develops sailing programs, competitions, and safety standards across the country.
A cover that fits over the mainsail when it's furled to protect it from sun and weather.
The lower edge of a sail that runs along the boom when the sail is fully extended.
A space used for the manufacturing and repair of sails. Often large, open, and found above other rooms (thus the name "loft").
A collection of tools, threads, and materials used for on-board sail repairs, such as sewing needles, sailcloth patches, and adhesive.
A method of reefing or reducing sail area by folding or dropping a portion of the sail onto the boom.
A small fitting or device that attaches to the luff (leading edge) of a sail and slides into a sail track.
A device or clutch used to secure a line or halyard to hold a sail in a desired position.
A tie used to bind a sail when it's furled.
A device or fitting used to prevent a sail slide or car from sliding off the end of a sail track.
An organization that promotes youth development and international friendship through sail training programs. It organizes tall ships races, regattas, and training opportunities for young people around the world.
Sail Twine
Saildrive
Strong thread or light string used in sailmaking and for other jobs that require a hard-wearing thread.
A propulsion system specifically designed for sailboats, with a diesel engine mounted inside the hull and a
SailGP
Sailing Hall of Fame
Sailing Vessel
Sailing Yacht
Sailmaker
Sailmaker's Palm
Salvage
Salvage
Salvage Agreement
Salvage Master
Salvage Tug
folding propeller attached to a saildrive leg.
A high-performance sailing championship that features national teams competing in identical foiling catamarans. SailGP aims to showcase the excitement and innovation of modern sailing through fastpaced, close-quarter racing.
An institution that recognizes and celebrates the achievements of outstanding sailors, designers, and contributors to the sport of sailing. Different countries and organizations have their own sailing halls of fame.
Any vessel under sail, provided that propelled solely by its sails and not using machinery. (COLREGS)
A yacht primarily propelled by sails and wind power.
A professional or specialist who designs, repairs, and manufactures sails, ensuring they are constructed to the highest standards.
A protective leather strap worn on the hand of a sailmaker, having a metal pad to push the needle when sewing.
The act of saving a vessel or its cargo from loss or damage.
The process of recovering, stabilizing, or rescuing a vessel or its cargo in distress or following an accident.
A contract between the owner of a distressed vessel and a salvage company or salvor, defining the terms and compensation for salvage services.
An experienced professional who manages salvage operations, including planning, coordination, and execution.
A specialized tugboat equipped with salvage equipment and machinery for towing and assisting vessels in distress.
Sand The loose granular material made up of small particles, typically found on beaches and formed by the erosion and weathering of rocks.
Santa Maria
SAR Convention
SART (Search and Rescue Transponder)
The largest of Christopher Columbus' ships on his first voyage to the Americas in 1492, representing the Age of Discovery.
The International Convention on Maritime Search and Rescue, an international treaty that provides a framework for coordinating and conducting search and rescue operations at sea. The convention establishes global standards and protocols for SAR activities.
A radar transponder used in search and rescue operations. When activated, SARTs produce a distinctive radar reflection that helps search and rescue teams locate vessels or life rafts in distress.
Sastrugi Irregular grooves or ridges formed on a snow surface by wind erosion and deposition, and found in the polar regions.
Satellite Constellation
The group of satellites that make up a particular satellite navigation system, such as the GPS constellation, consisting of multiple satellites in orbit around the Earth.
Satellite EPIRB A type of EPIRB that is designed to be manually activated by a person in distress. Once activated, it sends out a distress signal via satellite.
Satellite Imagery Images of Earth or other planets collected by Imaging satellites.
Satellite Navigation
The use of satellite-based navigation systems, such as GPS, GLONASS, or Galileo, to determine precise positions, velocities, and timing information for navigation purposes.
Satellite Phone (or Satphone)
SatNav (Satellite Navigation)
Scale
Scantlings
Scavenging System
Schooner
Scope
Scouring
A type of mobile phone that connects to telecommunication satellites instead of terrestrial cell sites, allowing for communication in remote areas or out at sea.
A system of satellites that provide geo-spatial positioning with global coverage and allow small electronic receivers to determine their location to within a few meters using time signals transmitted along a line of sight by radio from satellites.
The ratio of the distance on a map, chart, or photograph to the actual distance on the ground.
The dimensions of the structural parts of a boat, such as thickness of hull plating or size of frames.
The system that supplies fresh air to remove residual exhaust gases from the combustion chamber of a two-stroke marine diesel engine.
A type of sailing vessel characterized by the use of fore-and-aft sails on two or more masts with the forward mast being no taller than the rear masts.
The ratio between the length of anchor rode (chain or rope) deployed and the vertical distance from the bow of the vessel to the seabed. A sufficient scope is crucial for good anchor holding.
The process by which wind, water, or ice remove sediment from a landscape.
SCR Selective Catalytic Reduction - A technology used in marine engines to reduce nitrogen oxide (NOx) emissions by injecting a urea-based solution into the exhaust system, converting NOx into nitrogen and water.
Scuba
An acronym for "Self-Contained Underwater Breathing Apparatus," which allows divers to breathe underwater using a gas supply carried in a tank on their backs.
Scull To propel a boat by moving an oar or rudder side to side in the water.
Scuppers Drainage holes on deck, in the toe rail, or in bulwarks or (especially) in the deck edge of a ship.
Sea Anchor
Sea Breeze
A device used to stabilize a boat in heavy weather. Unlike a regular anchor, a sea anchor is deployed in deep water with no connection to the sea floor.
A breeze blowing toward the land from the sea, especially during the day owing to the relative warmth of the land.
Sea Smoke (or Frost Smoke) Fog which is formed when very cold air moves over warmer water.
Sea Surface Temperature (SST)
Seabed Classification
Seakeeping
Seal
Sealed Battery
The temperature of the top millimeter of the ocean's surface.
The categorization of the seafloor based on its geological and sedimentary characteristics, important for understanding the composition and stability of the seabed.
The characteristics of a boat that affect its ability to remain comfortable and safe in different sea conditions.
A tamper-evident device used to secure containers or cargo, ensuring the integrity and security of the goods during transportation.
A battery that is completely sealed, preventing the electrolyte from leaking or requiring maintenance. Sealed batteries are often maintenance-free and can be installed in various orientations.
Search and Rescue (SAR) The coordinated efforts to locate, assist, and save individuals in distress at sea or in other maritime environments.
Seashells
Seaworthy
Second Engineer
Securité
The hard, protective outer coverings of marine animals found washed up on the beach, such as shells from mollusks or crustaceans.
A ship or boat's ability to meet suitable conditions for navigating the sea or a lake securely.
The engineer next in rank to the chief engineer and upon whom the responsibility for the mechanical propulsion and the operation and maintenance of the mechanical and electrical installations of the ship will fall in the event of the incapacity of the chief engineer.
A safety signal preceding an announcement about safety navigation or meteorological hazards.
Security The safety call signal, pronounced "securite", that someone aboard a boat, ship, aircraft, or other vehicle uses to declare a message about the safety of navigation or to give important meteorological warnings.
Security Inspection
Sedimentation
An inspection conducted by the U.S. Coast Guard to assess a vessel's compliance with security regulations, including access control, security plans, and threat assessment measures.
The natural process of deposition and accumulation of sediment, which can reduce the depth of a harbor or waterway over time.
Seelonce Feenee A proword used to announce the end of the distress situation on the radio channel.
Seelonce Mayday A proword used to impose silence on all stations during a distress situation on the radio channel.
Selective Availability (SA)
An intentional degradation of the GPS signal accuracy introduced by the U.S. Department of Defense until it was turned off in 2000. Its removal significantly improved the accuracy of civilian GPS receivers.
Seller's Broker A marine broker who represents the seller's interests in marketing and selling a vessel, including advertising, valuation, and negotiating offers.
Semi-Displacement Hull
A hybrid hull form that combines the characteristics of displacement and planing hulls, offering a balance between efficiency at lower speeds and the ability to achieve higher speeds when needed.
Semidiurnal Tide A tide that has two high waters and two low waters each day.
Serac A block or column of ice formed by intersecting crevasses on a glacier.
Setting The process of an anchor burying its fluke(s) into the seabed for secure holding.
Sewage Pump-out Boat A vessel specifically designed and equipped to collect and pump out black water from boats within a marina or harbor.
Sextant An instrument used to measure the angle between a celestial body and the horizon which is used in celestial navigation to determine latitude and longitude.
Shaft Drive A propulsion system that uses a shaft to transmit power from the engine to a propeller, commonly used in larger vessels.
Shallow Water Effect
The reduction in maneuverability and responsiveness of a vessel when operating in shallow water due to reduced water flow around the hull and propeller.
Shank The straight or curved part of an anchor that connects the fluke(s) to the anchor crown and stock.
Sheer The longitudinal curvature of the deck line.
Sheet A rope used to control the setting of a sail in relation to the direction of the wind.
Sheet Bend A knot used to join two ropes of different diameters or materials.
Ship Classification Society An independent organization that certifies the design, construction, and safety of ships according to
Ship Design
Ship Energy Efficiency Management Plan (SEEMP)
Ship Handling Simulator
Ship Implementation Plan (SIP)
Ship Inspection Report (SIRE)
Ship Lifting
Ship Propulsion
Ship Registry
Ship Sanitation Control Certificate
Ship Security Alert System (SSAS)
Ship Supplier
Ship Surveyor
Ship-handling
Ship's Plating
Shipboard Oil Pollution Emergency Plan (SOPEP)
Shipbreaking
Shipbuilding
Shipper
Shipyard
Shipyard Workers
Shirley Robertson
specific rules and regulations.
The process of conceptualizing and creating the plans, specifications, and arrangements for the construction of a ship.
A plan that outlines measures to improve a ship's energy efficiency, introduced under amendments to Annex VI of MARPOL.
A training system that replicates ship maneuvering and handling conditions to train and assess ship handling skills of seafarers.
A plan that a ship may develop and implement to prepare for and demonstrate compliance with the 2020 sulphur limit. SIPs are recommended by IMO but not mandatory.
A comprehensive inspection report prepared by an accredited inspector or surveyor detailing the condition and compliance of a ship.
The operation of raising a ship out of the water, typically using cranes or lifting equipment, for repairs or maintenance.
The means by which a ship is driven or propelled, such as engines, propellers, or waterjets.
A government entity responsible for maintaining a register of ships, providing documentation, and issuing registration certificates to ensure compliance with international standards.
A certificate issued by a port health authority or authorized agency indicating that a ship has undergone proper sanitation inspections and complies with international health regulations.
A system mandated by the IMO's ISPS Code that enables ships to send a distress signal to designated authorities or security providers in the event of a security threat or piracy incident.
A business that supplies a ship with equipment, provisions, and other necessary goods.
A professional responsible for conducting surveys and inspections of ships, assessing their condition, verifying compliance with regulations and standards, and issuing necessary certifications or reports.
The skill of maneuvering a ship or boat in small spaces, with particular reference to docking and undocking, avoiding other traffic
The metal plates that form the outer shell of the ship's hull and superstructure.
A plan that is intended to help respond to oil pollution incidents at the ship level. A requirement under Annex I of MARPOL.
The dismantling and recycling of old or decommissioned ships, ensuring safe and environmentally sound practices for workers and the surrounding environment.
The process of constructing new ships, including design, fabrication, and assembly of various components and systems.
The party or company responsible for preparing and arranging the shipment of goods, often the seller or exporter.
A facility where ships are built, repaired, and maintained.
Skilled professionals and laborers involved in various shipyard activities, such as welders, fitters, electricians, painters, and riggers.
British sailor and double Olympic gold medalist who became a prominent TV presenter and commentator in the sailing world.
Shore Power
Shore Power Cable
Shore Power Pedestal
Shore Power Supply
Shore Station
Shoreline
Shrouds
Signal Flag
Single Point Mooring (SPM) Certification
Electrical power supply provided to docked vessels, allowing them to shut down their engines and reduce emissions while at port.
A cable used to connect a boat's electrical system to a shore power pedestal, allowing the transfer of electrical power from the shore to the vessel.
A structure or unit located at the dock that provides electrical connections for boats to access shore power.
Electrical power provided to boats at the dock through a connection to the shore-based electrical grid. This allows boats to operate onboard systems without using their own engines or generators.
A land-based station in the maritime mobile service.
The boundary between the land and the water, where the beach is typically located.
The set of cables or wires that support the mast from the sides, providing lateral stability to the rigging.
A set of flags used for signaling messages between vessels, indicating specific meanings through various combinations and arrangements.
Certification by a classification society for safe and reliable mooring systems.
Single Screw Referring to a vessel with one propeller.
Sir Ben Ainslie British sailor and multiple Olympic gold medalist who is considered one of the most successful competitive sailors in history.
Sir Francis Chichester British aviator and sailor who made a solo circumnavigation of the globe in 1966-67, setting a record for the fastest solo circumnavigation.
Sir Francis Drake English privateer, explorer, and naval officer known for his circumnavigation of the globe and his involvement in defeating the Spanish Armada.
Sir Peter Blake
Sir Robin Knox-Johnston
A legendary New Zealand sailor who won the America's Cup with Team New Zealand in 1995 and 2000. He was renowned for his contributions to sailing and marine conservation before tragically losing his life in 2001.
The first person to sail single-handed and non-stop around the world in the Golden Globe Race in 19681969. He is a highly respected British sailor and a prominent figure in the sailing community.
Skiff A small, fast, and maneuverable boat often used by pirates to approach and board larger vessels during attacks.
Slack Water
Slack Water or Slack Tide
Sleet
The state of a tidal current when its speed is near zero, especially the moment when a reversing current changes direction and its speed passes through zero.
The state of a tidal stream when its speed is near zero, especially the moment when a reversing current changes direction and its speed is zero. The term is also used for the entire period of low velocity near the time of turning of the current when it is too weak to be of any practical importance in navigation.
A form of precipitation consisting of ice pellets, often mixed with rain or snow.
Slip A narrow waterway or channel between piers or structures used for maneuvering or berthing vessels.
Slipway
A ramp or inclined plane used to launch or haul out vessels from the water for maintenance or construction.
Sloop
Slops Chest
Small Craft Code
Small Passenger Vessel
Snap Shackle
Snow Blindness
Snow Squall
Snuffer
SOLAS
SOLAS Compliance
SOLAS Convention
A one-masted sailboat with a single jib attached to the forestay, with a mast located about a third of the boat's length aft from the bow.
A supply of clothing and other items for sale to seamen in case of necessity.
A set of standards and regulations established by international maritime organizations, such as the International Maritime Organization (IMO), to ensure the safety and stability of small vessels, including recreational boats and commercial craft under a certain size threshold.
A vessel intended for carrying a limited number of passengers for hire, typically for short-distance or coastal cruises, excursions, or charter operations. Small passenger vessels are subject to specific regulations and safety requirements.
A fast-action shackle used for temporary connections.
A temporary loss of vision due to overexposure of the eyes to the sun's UV rays reflected from the snow, a common risk in high latitude sailing.
A sudden moderately heavy snow fall with blowing snow and strong, gusty surface winds.
A large funnel shaped device used to help with the hoisting and dousing of spinnakers.
International Convention for the Safety of Life at Sea - An international treaty that sets minimum safety standards for ships, addressing areas such as construction, equipment, and operational procedures.
Adherence to the requirements of the International Convention for the Safety of Life at Sea.
An international maritime treaty which sets minimum safety standards in the construction, equipment and operation of merchant ships.
SONAR (Sound Navigation and Ranging) is a technology that uses sound waves to detect, locate, and map objects or features underwater.
Sonar (Sound Navigation and Ranging)
Sonar Display
SOS
Sounding
SOx Emission Control Area (SECA)
Spar
Special Survey
Speed Over Ground (SOG)
Spinnaker
Spinnaker Pole
A system that uses sound propagation to navigate, communicate with or detect other vessels.
The visual representation of the SONAR data, often presented on a screen or display. The sonar display provides real-time or recorded information about underwater objects, features, and the seafloor, allowing operators to interpret and analyze the SONAR data.
An internationally recognized distress signal in Morse code, used in radio communications.
A measurement of the amount of fuel in a tank using a sounding tape or similar device.
Designated sea areas in which stricter controls were established to minimize airborne emissions from ships as per Annex VI.
A general term for any mast, yard, boom, gaff, or bowsprit on a sailing vessel.
A comprehensive survey that examines a ship's structure, equipment, and systems in detail.
The actual speed at which a vessel is moving over the ground, as determined by a GPS or satellite navigation system.
A large, lightweight sail used when running or reaching that is hoisted in front of all other sails and with a shape of a parachute.
A horizontal spar used to hold out the spinnaker sail away from the boat, allowing it to catch the wind more effectively.
Spinnaker Sock
Splicing
Spoil
Sponson
Sport Yacht
Sportsfish Yacht
Spring Line
Spring Tides
Squall
Square Knot (Reef Knot)
Squawk Code (or simply Squawk)
A device used to control and facilitate the launching, flying, and dousing of a spinnaker sail.
The process of joining two rope ends together or creating a permanent loop by weaving the fibers of the rope.
The excavated material, such as sand, silt, or mud, that is removed during the dredging process.
Projection from the side of a watercraft, for protection, stability, or the mounting of equipment such as armaments or lifeboats, amongst other things.
A fast and sleek motor yacht designed for sporty cruising and high-performance sailing.
A motor yacht designed for recreational fishing, often featuring fishing amenities, a large cockpit, and specialized storage for equipment.
A pivot line used in docking and undocking, or to prevent the boat from moving forward or astern while made fast to a dock.
A tide just after a new or full moon, when there is the greatest difference between high and low water.
A sudden, sharp increase in wind speed lasting minutes, often associated with active weather.
A binding knot used to join two ropes of similar size together.
A four-digit code given to a pilot by air traffic control, to enter into a transponder, for radar identification and correlation of radar target with the aircraft.
SS Great Eastern British steamship designed by Isambard Kingdom Brunel, known for its innovative engineering and capacity, setting records during its time.
SSB (Single Side Band) Radio
Stabilizers
Stand-On Vessel
Standards of Training, Certification and Watchkeeping for Seafarers (STCW)
Star Class
Starboard
Starting Line
Static Rope
Statutory Certification
Statutory Survey
A type of modulation, used to derive two sidebands from the amplitude modulation of a carrier signal. It's often used in marine communication.
Fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship's roll due to wind or waves.
According to the Navigation Rules, the vessel that must maintain its course and speed unless it becomes apparent that the give-way vessel is not taking appropriate action.
A convention of the International Maritime Organization that sets minimum qualification standards for masters, officers, and watch personnel on seagoing merchant ships.
A two-person keelboat class that has been part of the Olympic Games for many years. The Star class is known for its tactical racing and has attracted many renowned sailors throughout its history.
The right side of the boat when you are looking forward.
The line between two markers where the race begins, and yachts must position themselves before the start signal.
A rope designed to minimize stretch, commonly used in applications where minimal elongation is desired, such as anchor lines or safety lines.
Issuance of certificates by a flag state administration to verify compliance with international conventions.
A survey required by international, national, or regional regulations to ensure compliance with safety, environmental, and operational standards. It includes surveys related to stability, lifesaving appliances, fire
Stem
Stern Line
Stern Thruster
Sterndrive
Stock
Stocktaking
Stopper Knot
Storm Jib
Storm Trysail
Storm Warning
Stormwater Management
Stowage
Strake
Stringer
Structural Plan
Approval
Sub-Charter
Submarine
Sue and Labor Clause
Sulphur Emission Control Areas (SECAs)
Superstructure
Superyacht
Surf
Surf Zone
Surge
protection, pollution prevention, and navigation equipment.
The very forward part of the bow.
A docking line leading from the stern.
A maneuvering device located in the stern of a vessel used to provide additional lateral thrust for improved maneuverability.
A propulsion system that combines elements of inboard and outboard engines, with an engine mounted inside the vessel and a drive unit outside the transom.
The horizontal arm of an anchor that helps to stabilize it and ensure proper alignment with the seabed.
The process of counting and listing the amount and value of goods and materials in a ship's stores.
A knot used to prevent a rope from passing through a block or pulley or to create a larger knot at the end of a rope.
A small, heavy-duty sail used in strong winds or stormy conditions when a larger headsail is too powerful.
A small, heavy-duty sail flown in storm conditions, in place of a larger mainsail.
A warning of 1-minute sustained surface winds of 48 knots (55 mph or 88 kph) or greater, predicted or occurring, not directly associated with tropical cyclones.
The management of rainwater runoff within a marina to prevent pollutants, debris, and sediment from entering the waterways. This can involve strategies such as rain gardens, sediment traps, and filtration systems.
The act of arranging goods in a ship's hold and marking them for identification.
A continuous strip of hull plating that runs from the bow to the stern.
A longitudinal support affixed to the inside of the hull for added rigidity.
Certification by a classification society that a ship's design complies with structural requirements.
A secondary charter agreement where the charterer of the original charter party leases the vessel to another party.
A vessel that operates underwater, either fully submerged or surfaced, designed for stealthy operations and carrying out various naval tasks.
A clause that covers costs incurred to minimize or prevent further losses.
Designated sea areas in which stricter sulphur emission controls apply, leading to a requirement for the use of low-sulphur fuel oils.
The part of a yacht, including the upper works, that is built above the main deck.
A luxury yacht typically over 24 meters (79 feet) in length, equipped with high-end amenities and crewed by professionals.
The breaking of waves as they reach the shore, creating the foamy, turbulent water near the beach.
The nearshore area where waves break and the water becomes turbulent, typically the area where people surf.
The back and forth motion of water.
Survey
Surveyor
Survival Craft
Survival Radio
Survival Suit
Sweep Time
Swell
Swing Circle
Swinging Circle
Sydney to Hobart Yacht Race
Synoptic Chart
The process of inspecting and assessing the condition, integrity, and compliance of ships, vessels, or marine structures. Surveys may be conducted for various purposes, including safety, maintenance, regulatory compliance, and insurance.
A qualified professional who conducts inspections, surveys, and assessments of vessels to evaluate their condition, seaworthiness, and compliance with applicable standards.
A vessel designed to save lives in case of an emergency on board a ship, such as a lifeboat or liferaft.
A portable, waterproof, low power transmitter for use in survival situations, particularly following the downing of an aircraft.
A protective suit worn by individuals in cold-water environments to enhance survivability by providing insulation and buoyancy.
The time taken for a radar antenna to complete one full 360-degree rotation.
A series of mechanical waves that propagate along the interface between water and air.
The circle made by a ship swinging at anchor.
The circle a vessel will swing in when at anchor as a result of tidal stream or wind changes.
An iconic offshore race held annually in Australia, starting in Sydney and finishing in Hobart, Tasmania, covering a distance of approximately 630 nautical miles.
A weather map that presents a summary of the weather situation.
Tabular Iceberg
Tack
Tack Line
Tacking
Tailshaft Survey
Tanker
Tanker Classification
Tariff Classification
Tell-tales
Telltales
Temporary Importation
Tender
Territorial Waters
Terrorism at Sea
The Chartered Institute of Logistics and Transport (CILT)
The Institute of Chartered Shipbrokers
The Institute of Marine Engineering, Science and Technology (IMarEST)
The Institute of Marine Surveying
The International Marine Contractors Association (IMCA)
The Nautical Institute
A type of iceberg characterized by steep sides and a flat top. They are mostly found in the Antarctic region.
The lower forward corner of a sail, or a verb meaning to change direction by turning the bow of the boat through the wind.
A line used to control the foot of a downwind sail such as a spinnaker or gennaker.
Changing the direction of the yacht's course by turning the bow through the wind, typically used when sailing upwind.
A specific survey that focuses on the condition and alignment of the ship's propeller shaft, bearings, and related components.
A type of ship designed for the transportation of liquid or gaseous cargo, such as crude oil, petroleum products, or liquefied natural gas.
Specific classification standards and rules for tanker ships.
The process of determining the correct tariff code or classification for goods, which determines the applicable customs duties and taxes.
A pair of thin strips of material, such as yarn, attached to sails, shrouds and stay to indicate wind direction.
Thin pieces of yarn or tape attached to sails to indicate airflow and aid in trimming and optimizing sail performance.
The temporary entry of goods into a country for a specific purpose or duration without payment of import duties or taxes. These goods are expected to be re-exported within a specified timeframe.
A smaller boat used to transport people or goods to and from shore when the larger vessel cannot dock, often stored on the yacht.
The area of sea adjacent to a coastal state's land territory, subject to its sovereignty and jurisdiction.
Acts of terrorism carried out in the maritime domain, targeting ships, ports, or other maritime infrastructure for political, ideological, or criminal purposes.
A professional body that encompasses the logistics, transport, and supply chain sectors, offering qualifications and promoting best practices.
A professional body that provides education and training for individuals in the shipbroking and maritime business sectors.
A professional organization dedicated to promoting and developing marine engineering, science, and technology worldwide.
A professional body that represents marine surveyors and promotes best practices and professional standards in the field of marine surveying.
A trade association that represents the interests of offshore, marine, and underwater engineering contractors, promoting safety, environmental responsibility, and technical standards.
A global organization that promotes professional excellence and knowledge in the maritime industry, particularly in the areas of navigation, seamanship, and ship operations.
The Royal Institution of Naval Architects (RINA)
The Society of International Gas Tanker and Terminal Operators (SIGTTO)
Thermal Imaging
Thermohaline Circulation
Thimble
Three-Strand
Throwing Line
An international professional institution that focuses on the design, construction, and operation of naval architecture and marine structures.
An international organization that provides guidance and promotes safety and best practices in the design and operation of gas tankers and terminals.
A technology used in FLIR (Forward-Looking Infrared) cameras to capture infrared radiation emitted by objects and create images based on the temperature differences in the scene. It allows users to detect and visualize heat signatures, making it valuable for marine applications such as search and rescue, navigation, and identifying potential hazards.
An oceanic circulation pattern that drives the mixing of surface water and deep water, crucial for supplying heat to the polar regions and thus for regulating global climate.
A metal reinforcement grommet within a loop or eye on a line, used to prevent chafing and prolong the life of the line.
A type of rope construction consisting of three strands twisted together, commonly used in generalpurpose applications.
A lightweight and buoyant rope with a throwable bag, used for rescue purposes or to establish a temporary connection between vessels.
Thrust The propelling force exerted by a propeller or jet engine.
Thruster
Thruster Assist
Thule
Tidal Bore
Tidal Bulge
Tidal Current
Tidal Datum
Tidal Diamond
Tidal Period
Tidal Prediction
Tidal Range
Tidal Station
Tidal Stream
Tidal Surge
A small propeller or jet drive used to move, position, or turn a ship or boat.
The use of thrusters, such as bow thrusters or stern thrusters, to aid in ship maneuvering, particularly in confined or challenging situations.
A term used in classical European literature and maps to refer to the northernmost part of the inhabited world, usually associated with high latitude regions.
A large wave or series of waves caused by a high, incoming tide passing up a narrow bay, estuary, or river.
The deformation of bodies caused by the gravitational forces of other nearby bodies.
The horizontal movement of water caused by the tides, including both the flood and ebb currents.
A base elevation used as a reference from which to reckon heights or depths. It is derived from some phase of the tide.
Information on a nautical chart that indicates the speed and direction of tidal streams.
The length of time between high tides or low tides.
The forecasting of the time and height of tides.
The vertical difference between the high tide and the succeeding low tide.
A place where long-term tidal observations are recorded.
The movement of water caused by tidal currents, with tidal stream atlases and charts providing information on direction and strength.
An unusual rise in sea level due to atmospheric pressure changes or strong winds, also known as a storm surge.
Tidal Wave
Tidal Zone
Tide
Tide Clock
Tide Gauge
Tide Head
Tide Rip
Commonly used to describe a tsunami or a storm surge, but in its strictest sense, it refers to a wave caused by the gravitational interactions between the Sun, Moon, and Earth.
The area of the beach that is affected by the rise and fall of tides, typically characterized by wet and dry zones.
The regular rise and fall of the ocean's surface caused by the gravitational forces of the Moon and the Sun.
A specially designed clock that keeps track of the moon's apparent motion around the earth.
An instrument used to measure and record the rise and fall of tides, providing crucial data for hydrographic surveys and navigation.
The leading edge of the incoming tide, such as a tidal bore.
A turbulent, confused, agitated, or breaking sea state caused by opposing tidal currents or a tidal current crossing a shoal.
Tide Tables Tables that provide predicted times and amplitude (or "tidal range") of tides at a particular coastal location.
Tiller
Time Charter
Time Correction
Time To First Fix (TTFF)
A bar or handle for turning a boat's rudder or an outboard motor.
A type of charter agreement where the charterer hires the vessel for a specified period, typically paying a daily or monthly rate, and assumes responsibility for operating costs.
Adjustments made to the elapsed time of each yacht based on its rating, ensuring fair results in different yacht classes.
The time it takes for a GPS receiver to acquire and calculate a position fix after being powered on or after losing satellite signal reception.
Titanic Legendary British passenger liner that tragically sank on its maiden voyage in 1912, leading to significant improvements in maritime safety.
Title Search
Tonnage Measurement
Topography
Topping Lift
Topsail
Torben Grael
Total Loss
Tow Rope
A thorough investigation of a vessel's ownership history, liens, encumbrances, and legal status to ensure a clear and valid title for transfer.
The process of determining a vessel's gross tonnage, net tonnage, and other tonnage measurements, which have implications for regulatory requirements and fees.
The detailed mapping or charting of the features of a relatively small area, district, or locality.
A line which applies upward force to the boom or a yard. Can be used to prevent the boom from falling into the cockpit when the sail is not raised.
A sail set above the course sail, on the topsail yard, next above the lowermost yard on a square-rigged mast.
Brazilian sailor and five-time Olympic medalist, considered one of the greatest Olympic sailors of all time.
A loss where the insured property is completely destroyed or lost.
A rope used for towing or being towed by another vessel, typically designed with high strength and durability.
Track The path followed by a vessel or object over time, as recorded by a GPS or satellite navigation system.
Tracy Edwards
British sailor who skippered the first all-female crew in the Whitbread Round the World Race in 1989-90,
Transat Jacques Vabre
Transatlantic Race
Transit
Transom
Transponder
Transshipment
Traveler
Trawler Yacht
Tri-Deck Yacht
Trim
Trimaran
Trimming
Tropical Storm
Trough
Trucker's Hitch
True North
Tugboat
Turbocompound
Turk's Head Knot
Turn of the Bilge
Turnbuckle
Turning Circle
challenging gender stereotypes in sailing.
A biennial transatlantic race for double-handed crews, starting in Le Havre, France, and finishing in various destinations in the Americas, including Brazil and the Caribbean.
A challenging offshore yacht race that takes place across the Atlantic Ocean. It attracts both professional and amateur sailors, with different editions featuring various starting and finishing locations.
An imaginary line between two objects (buoys, landmarks, etc.) used in navigation to ensure you are on the correct course.
The flat surface forming the stern of a vessel. In motor yachts, outboard motors or the propeller drives for inboard motors are typically mounted on the transom.
An electronic device that produces a response when it receives a radio-frequency interrogation.
The process of transferring cargo from one vessel to another at an intermediate port during its journey to the final destination.
A device that allows the boom to move laterally and is used in conjunction with the mainsheet to position the boom correctly for the direction of the wind.
A motor yacht designed for long-distance cruising and fuel efficiency, characterized by a displacement hull and a comfortable cruising speed.
A motor yacht with three levels or decks, providing ample interior space, multiple cabins, and various onboard amenities.
To adjust the sails to maximize their efficiency, or the position of the sails relative to the direction of the wind and the desired course.
A yacht with three parallel hulls, providing stability and speed.
Adjusting the sails and rigging to optimize the yacht's performance and balance, maximizing speed and efficiency.
A tropical cyclone in which the maximum sustained surface wind speed ranges from 34 knots (39 mph or 63 kph) to 63 knots (73 mph or 118 kph).
The lowest point of a wave, typically characterized by a curvature or dip.
A knot used for securing a load or creating a taut line between two points.
The direction of the North Pole relative to the navigator's position.
A small, powerful vessel used for towing or pushing other ships, assisting in ship maneuvering, or performing harbor and terminal operations.
A technology used in some marine diesel engines to recover energy from exhaust gases and convert it into additional power, increasing overall engine efficiency.
A decorative knot used for grip and identification purposes.
The point on a hull where the bottom curves up and inward to become the side of the boat.
A mechanical device used to adjust the tension of rigging wires or cables, consisting of a threaded body and two end fittings.
The path or circle formed by a vessel when making a full turn at a given speed and rudder angle.
Twin Screw Referring to a vessel with two propellers, often for added maneuverability and redundancy.
Typhoon A tropical cyclone that occurs in the western Pacific or Indian Oceans.
U.S. Coast Guard (USCG) The federal agency responsible for enforcing maritime laws, regulations, and safety standards within U.S. waters.
UK Extra First Class Engineer Certificate
UK Marine and Coastguard Agency (MCA)
Ullage
Ultrasonic Thickness Measurement (UTM)
UNCLOS
Undertow
Underwater Hull Cleaning Equipment
Underwater Inspection
Underwater Navigation
Underwater Survey
Underway
Upwelling
A qualification awarded by the UK Maritime and Coastguard Agency. It demonstrates advanced competency in the operation and maintenance of a ship's mechanical systems.
An executive agency of the UK government, responsible for the coordination of maritime search and rescue in waters around the UK, inspection and quality control of commercial maritime activities, and maintaining a register of British ships.
The amount of empty space left in a fuel or liquid cargo tank, or a container or cylinder, especially one that is full or intended to be full.
A non-destructive testing method used during surveys to measure the thickness of a ship's steel or metal plates. It helps identify areas of corrosion, erosion, or metal thinning.
United Nations Convention on the Law of the Sea - An international treaty that sets out the legal framework for the use and protection of the world's oceans and marine resources.
A powerful current flowing seaward beneath the breaking waves, resulting from the backwash of water from the beach.
Tools and equipment used to clean and remove fouling from a vessel's underwater hull, improving its performance and fuel efficiency.
A survey conducted beneath the waterline of a ship or vessel using divers or remotely operated underwater vehicles (ROVs). It assesses the condition of the hull, propellers, sea chests, and other submerged parts.
The skill of using compasses, natural features, and dive site landmarks to navigate underwater and return safely to the starting point.
An assessment of submerged structures or areas to identify potential hazards, damage, or obstacles.
A term used to describe a vessel which is not at anchor, or made fast to the shore, or aground.
The upward movement of cold, nutrient-rich water from the deep ocean to the surface, often associated with the displacement of surface water by wind or other forces.
Upwind Sailing against the wind, making progress towards the windward mark or point of the course.
USCG (United States Coast Guard)
USS Arizona
USS Constitution
The U.S. military service tasked with maritime law enforcement, maritime response, and maritime safety.
American battleship sunk during the attack on Pearl Harbor in 1941, serving as a memorial and a symbol of sacrifice and remembrance.
Iconic American frigate known as "Old Ironsides" for its sturdy construction, famous for victories during the War of 1812 and still in active service.
USS Enterprise Aircraft carrier of the United States Navy, one of the most decorated warships in history, with significant service in World War II and subsequent conflicts.
USS Missouri
American battleship that hosted the surrender of Japan in World War II, representing the end of the war and the beginning of a new era.
USS Monitor First ironclad warship commissioned by the United States Navy during the American Civil War, known for its historic battle with the CSS Virginia.
Valuation
Vang
Variable-Pitch Propeller
Variation
The process of determining the fair market value of a vessel, taking into account factors such as age, condition, specifications, and recent market trends.
Also known as a boom vang. A line or piston system used to control the angle of the boom to the mast, preventing it from rising when the sheet is eased.
A propeller with adjustable blades that can change their pitch to optimize performance and fuel efficiency at different speeds and load conditions.
The angle between magnetic and true north at a particular location.
Vasco da Gama (1460-1524) Portuguese explorer who was the first to sail directly from Europe to India, establishing a direct sea route and opening up trade between Europe and Asia.
VDR (Voyage Data Recorder)
Similar to an aircraft's black box, it is a data recording system designed for all vessels required to comply with the IMO's International Convention SOLAS Requirements in order to collect data from various sensors on board the vessel.
Vector Control
Vendée Globe
Vessel
Vessel Classification
Vessel Documentation
Vessel Energy Efficiency Survey
Vessel Hardening
Vessel Inspection
Vessel Sanitation Program (VSP)
Vessel Traffic Service (VTS)
VHF (Very High Frequency)
DSC (Digital Selective Calling)
Victualing
Measures implemented to control or prevent the spread of disease-carrying organisms, such as mosquitoes or other vectors, aboard ships and within port areas. This can include insecticide treatments, inspections, and elimination of breeding sites.
A solo, non-stop, around-the-world yacht race that takes place every four years. It is considered one of the toughest and most challenging races in the world, testing the skills and endurance of the participants.
Another term for a ship or boat.
The categorization of ships and vessels based on various criteria such as size, type, intended use, construction standards, and operational capabilities. Classification societies provide rules and standards for classifying vessels.
The collection and preparation of necessary documents, certificates, and registrations required for the sale, transfer, or charter of a vessel.
An assessment of a ship's energy efficiency and compliance with environmental regulations.
The reinforcement of ships' structures and installations to make them more resistant to pirate attacks. This can include the use of barbed wire, fencing, secure citadels, and physical barriers.
The process of examining a vessel to ensure compliance with applicable U.S. Coast Guard regulations and safety requirements.
A program implemented by the Centers for Disease Control and Prevention (CDC) in the United States to ensure the sanitation and public health standards of cruise ships. It involves inspections, monitoring, and enforcement of health and hygiene regulations
A service provided by authorities in busy ports or waterways to monitor and manage vessel traffic. VTS operators provide navigational assistance, traffic information, and safety advice to vessels within their jurisdiction.
A method used to call specific vessels or groups of vessels by sending a digital signal on a reserved VHF channel. Part of the GMDSS system.
The provision of food and drink to a ship for its voyage, also known as victualling.
Visibility
Volatile Organic Compounds (VOCs)
Volvo Ocean Race (now The Ocean Race)
Volvo Ocean Race / The Ocean Race
Voyage Charter
The distance one can see as determined by light and weather conditions.
Organic compounds that easily become vapors or gases. Along with carbon, they contain elements such as hydrogen, oxygen, fluorine, chlorine, bromine, sulfur, or nitrogen. The emission of VOCs from tankers is controlled by Annex VI of MARPOL.
A round-the-world yacht race held every three to four years. It features professional crews sailing state-ofthe-art yachts, and it is known for its challenging offshore legs and demanding conditions.
A grueling round-the-world race with professional crews competing in multiple legs, showcasing extreme sailing and testing the limits of the sailors' skills and endurance.
A type of charter agreement where the vessel is chartered for a specific voyage or series of voyages, with the shipowner responsible for operating costs.
VSP Voith Schneider Propeller - A specialized propulsion system that uses vertical rotating blades to provide thrust in any direction, offering exceptional maneuverability, particularly in confined spaces.
Wake The region of recirculating flow immediately behind a moving solid body, caused by the flow of surrounding fluid around the body.
War Risk Clause
War Risk Insurance
Warehousing
Warm Front
Warning Flag
A clause in the charter party that outlines the responsibilities, liabilities, and insurance requirements in relation to war or war-like operations.
Provides coverage for losses due to war or war-like operations.
The storage and management of goods within the port area, providing temporary or long-term storage solutions for cargo.
A boundary of an advancing warm air mass and retreating cooler air mass where warm air replaces cold air.
A flag used to indicate a warning signal before the start of a race or to warn about potential hazards or dangerous conditions.
Warping The process of moving a boat by lines, particularly in the confines of a harbor.
Waste Management Procedures and resources to manage waste produced by human activity on the ship, including sewage and garbage.
Watch A period of time during which a part of the crew is on duty to handle the sailing and security tasks.
Watch Circle
The area within which a vessel maintains its position while in dynamic positioning mode.
Water Quality Monitoring Regular testing and assessment of the water quality within and around the marina to identify any potential pollution sources and ensure compliance with water quality standards.
Waterline
Waterproof
Watertight
Watertight Bulkhead
The line where the hull of a ship meets the surface of the water.
Marine FLIR cameras are designed to be waterproof or water-resistant, allowing them to withstand exposure to water, humidity, and harsh marine environments. This feature ensures their reliability and durability in marine conditions, enabling their effective use on boats, ships, or other watercraft.
Constructed or designed to prevent the passage of water under specified conditions, ensuring the safety and integrity of the vessel.
A bulkhead that is designed to prevent water from flowing past it, thus providing compartments in a ship that can contain water in the event of a hull breach.
Wave The rhythmic disturbance or oscillation of water particles caused by the transfer of energy through wind, seismic activity, or other forces.
Wave Frequency
Wave Height
Wave Period
The number of waves passing a fixed point per unit of time, usually measured in waves per second (Hertz).
The vertical distance between the crest and trough of a wave.
The time it takes for two consecutive wave crests (or troughs) to pass a fixed point.
Waves The rhythmic movement of water along the shoreline, typically caused by wind and ocean currents.
Waypoint
Weather Balloon (Radiosonde)
Weather Buoy
A specific location defined by latitude and longitude coordinates in a GPS system. Waypoints are used to navigate along a planned route.
A balloon which carries instruments aloft to send back information on atmospheric pressure, temperature, humidity and wind speed by means of a small, expendable measuring device called a radiosonde.
A buoy that gathers weather and ocean data.
Weather Deck
Weather Forecast
Weather Helm
Weather Ship
Welding
Welding
The deck exposed to the outside environment.
A prediction of weather conditions for a specific area over the next few hours or days.
The tendency of a sailboat to turn into the wind in response to increased wind force. The opposite of lee helm.
A ship stationed in the ocean as a platform for surface and upper air meteorological observations for use in weather forecasting.
The process of joining two pieces of metal together by heating the surfaces to the point of melting and then pressing them together. Used extensively in aluminium yacht construction.
The process of joining metal pieces together using heat to create a strong, permanent bond.
Wetsuit A form-fitting suit made of neoprene that provides thermal insulation and protection from the underwater environment.
Wharf A structure on the shore of a harbor where ships may dock to load and unload cargo or passengers.
Wharf A structure built along the shoreline for ships to load and unload cargo.
Whiteout
Williwaw
Winch
Winch Line
Wind Chill
Wind Feed Forward
Wind Wave
Windage
Windlass
Windward
Windward
Winter Over
Winterization
World Match Racing Tour
World Sailing
An atmospheric condition of snow and cloud which reduces visibility to very low levels, a common hazardous condition encountered in high latitude sailing.
A sudden blast of wind descending from a mountainous coast of high latitudes to the sea.
A mechanical device used for winding or unwinding ropes, cables, or chains, typically used for hoisting or towing operations on a vessel.
A strong and durable rope used with a winch to pull or hoist heavy loads.
The lowering of body temperature due to the passing-flow of lower-temperature air, a common concern in high latitude sailing.
A function of a DP system that takes into account the effect of wind on the vessel and compensates accordingly.
A surface wave that develops in water as a result of wind that blows for a duration of time over a fetch.
The effect of wind on the course of a vessel, especially one with a large superstructure.
A type of winch used on boats and ships to drop and hoist anchors.
The direction upwind from the point of reference. The opposite of leeward.
The direction from which the wind is coming, typically the upwind side of the course.
To spend the winter in one location, often due to inaccessibility caused by severe weather conditions.
The process of preparing a ship for operations in icy or cold conditions, including measures such as insulation, heating systems, and antifreeze protection.
A professional sailing series that showcases the skills of the world's top match racing sailors. It features high-speed, one-on-one racing in identical boats, emphasizing tactics and boat handling.
The international governing body for the sport of sailing, responsible for promoting and regulating the sport globally. It organizes various events, sets the rules and standards for sailing competitions, and represents sailing in the Olympic Games.
World Trade Organization (WTO)
Wreck Removal
An international organization that deals with the global rules of trade between nations, ensuring the smooth flow of international trade.
The process of removing wrecked or sunken vessels or debris from a harbor or waterway to ensure safe navigation.
X Band Satellite Communications
Yacht
Yacht Broker
Yacht Design Ratios
Yachtmaster
Yardarm
Yaw
Yawing
Yawl
Zephyr
Zero Visibility
Zheng He (1371-1433)
Zigzag Test
Zinc Anodes
Zulu Time
X band operates in the frequency range between 8 and 12 GHz, providing high-quality, secure communications with narrow beams and resistance to rain fade, often used in military and government applications.
A recreational boat or ship primarily used for pleasure cruising or racing, typically owned and operated by private individuals.
A marine broker specializing in the buying, selling, and chartering of yachts and luxury vessels.
Calculations used by yacht designers to predict the performance and stability of a yacht, such as Length to Beam Ratio, Sail Area to Displacement Ratio, and Displacement to Length Ratio.
A qualification providing the skills needed to skipper a yacht on extended offshore passages by day or night. There are multiple levels of Yachtmaster certification, including Coastal, Offshore, and Ocean.
A spar on a mast from which sails are set. It may be constructed of several pieces and has hoops, called yard slides, that run on the mast.
To swing or steer off course, as when running with a quartering sea.
The side-to-side movement of a boat's bow, causing it to deviate from a straight course.
A two-masted sailing craft similar to a sloop or cutter but with an additional mizzen mast well aft of the mainmast, often right on the transom. In heavy weather, a yawl might reduce sail to just the mizzen and jib, to keep the bow to the wind and waves.
A gentle breeze from the west. In classical mythology, Zephyr was the god of the west wind.
A light or west wind.
Chinese explorer who commanded seven naval expeditions in the 15th century, reaching as far as Africa and greatly expanding Chinese maritime influence.
A situation in which weather conditions (heavy rain, snow, fog, etc.) make visibility almost nonexistent, complicating navigation.
A maneuvering test where the course of a vessel is alternately changed to either side using helm angles greater than 10 degrees. Used to determine a vessel's maneuverability.
Pieces of zinc metal attached to the hull of a yacht to reduce the corrosion of the hull itself. The zinc 'sacrifices' itself by corroding first. This is known as cathodic protection.